My mom (early 60s) has a hard time remembering the names of anime, or sometimes chooses to use her own nicknames for them. I have always enjoyed sharing these and sometimes quizzing people on what the original title might've been.
Here's a nice long list of every name I've recorded, ordered from most opaque to most obvious, followed by the actual name of the series. Feel free to comment how many of these anime you got, and how many nicknames/misrememberings you had to look at before you got it.
Optional drinking game: take a shot every time you see "girl(s)"
Without further ado:
Series 1:
Gremlin Girl
Actual title
Himouto! Umaru-chan
Series 2:
Golden Girls
Title 2
Khoisan Mosaic
Title 3
Kimoi Mosaic
Title 4
Koizumi Mosaic
Title 5
Kimono Mosaic
Title 6
Kimona Mosaic
Actual title
Kin'iro Mosaic (Kinmoza)
Series 3:
Slime Time
Title 2
300 Levels
Title 3
30 Levels, 300 Years I've Played the Game
Actual title
I've Been Killing Slimes for 300 Years and Maxed Out My Level
Series 4:
Diarrhea Girls
Title 2
Diarrhea Days
Title 3
Fishy Friends
Title 4
Days of Our Diaries
Actual title
Diary of Our Days at the Breakwater (Houkago Teibou Nisshi)
Series 5:
Fuwa Fuwa Girls
Title 2
Marshmallow Girls
Actual title
Strawberry Marshmallow (Ichigo Marshmallow)
Series 6:
Tanktop Girls
Title 2
Panzer Girls
Actual title
Girls und Panzer
Series 7:
Bunny Shows
Title 2
Bunny Girls
Title 3
Order of the Rabbit
Title 4
The Order is a Rabbit
Actual title
Is The Order a Rabbit? (Gochiusa)
Series 8:
Loido
Actual title
Spy x Family
Series 9:
Our Queen
Title 2
Queen Show
Title 3
Sakurako Quest
Actual title
Sakura Quest
Series 10:
Kaguya Sunshine Show
Title 2
My Friend the Tanuki
Title 3
Tanuko Rakugo
Title 4
My Fox Has No Tail
Actual title
My Master Has No Tail
Series 11:
Chubiyosha
Title 2
Chony-Byo
Title 3
Chunubiyo
Actual title
Love, Chunibyo, and Other Delusions (Chuunibyou demo Koi ga Shitai!)
Series 12:
Toilet Lad
Actual title
Toilet-Bound Hanako-kun
Series 13:
Monobakegatara
Actual title
Bakemonogatari
Series 14:
Buraddi Batafurai
Title 2
Chio-chan
Actual title
Chio's School Road
Series 15:
Candy
Title 2
Candy Store
Title 3
Daigashi
Actual title
Dagashi Kashi
Series 16:
Gretty Sko
Actual title
Aggretsuko
Series 17:
Golden Cayuga
Actual title
Golden Kamuy
Series 18:
Yokosuba
Actual title
KonoSuba
Series 19:
YuiYui
Actual title
K-ON!
Series 20:
Across the City
Title 2
Downtown
Title 3
The Town Turned Upside Down
Actual title
And Yet the Town Moves (SoreMachi)
Series 21:
Camping
Actual title
Laid-Back Camp (YuruCamp)
Series 22:
1, 2, 3, Let's Go
Title 2
1, 2, 3, Let's Move
Title 3
1, 2, 3, Let's Beeb
Title 4
3, 2, 1, Let's Beeb
Title 5
The Beebs
Actual title
Cowboy Bebop
Series 23:
Lucky Charms
Actual title
Lucky Star
Series 24:
Marriage
Title 2
Marriage Show
Actual title
Tonikawa: Over the Moon for You (Tonikaku Kawaii)
Series 25:
Giacometti
Title 2
Yakitori
Actual title
Joshiraku
Series 26:
Lazy Boy
Title 2
Hayowaga
Title 3
Haisuka
Title 4
Haikyuu
Actual title
Hyouka
Series 27:
The Devil Next Door
Actual title
The Demon Girl Next Door (Machikado Mazoku)
Series 28:
Love, Kaguya, and All The Stuff
Actual title
Kaguya-sama: Love is War
Series 29:
Nadia's Journey
Title 2
Nadia's Adventure
Title 3
Nadia's Travels
Title 4
Nadia: The Universe of Explosions
Actual title
Nadia: The Secret of Blue Water
Series 30:
Asoba Asobasai
Actual title
Asobi Asobase
3, 2, 1, Let's Beeb