Spanglish much? Parlais Franglais? Denglisch sprechen?

Yes and I got teased about it mercilessly for weeks after. All in good fun.

English is my native language. I have on more than one occasion gone blank trying to think of a word, only to remember it in Japanese. Which is particularly amusing when it's the kana-ised version of the English word I had forgotten.

Stampede

Wholesome

...

All. The. Time.

I'm not a very good speaker despite how well I write English (I just sound stiff and sometimes I just freeze up when I forget a word), but I know it better than my native language. Once I wanted to describe deer in a phone call, but I forgot what the word was in the native language... Cue me being clueless for a good few minutes before I figured it out.

Yes, especially with tech-words. Hell, I even don't know what for example "exploit" means in my native language.

The worst part for me is mixing sayings and the construction of sentences. I've never been that good at English grammar, but after using English more and more, my grammar in my native language have gotten worse. I'm half way in a sentence, in my native language, before I notice I've started on an English saying, but directly translated to my native language and it makes no sense. But, there's no cow on the ice, as you say, because my wife and I are like pots and pans, as you also say; we are the same way.