At step 4 it is not a straw anymore..

if you food poisoning you will be exiting out of both holes.

Got it, a CD has 2 holes as well.

If I'm not mistaken a human has 7 topological holes by default but not 100% sure

I was making a minnow net to catch baitfish for my son. To make a cone you need a half circle of material out of mesh.

Now in a 2D world the where there is no thickness this would be correct, if material can be added to fill gaps.

In a 3D world, any round object with a hole and some thickness could be a straw. A washer is a straw by this logic

If a flat disc has no holes, how many holes does the surface of a sphere have?

that meme format makes me feel old... I used to see it in like 2008 👴

Two people kissing make a single continous tube going from one anus to the other

A straw has zero holes. It's just a flat piece of plastic wrapped around and attached to itself. Ain't nobody drilling holes through plastic to make straws.

This suggests the reverse is true, that every hole is at minimum a tube.

I'm throwing out all my cups today. I'll jut drink from my plates.

you are what you eat: a donut

or sth

Good fucking science meme!

A straw has one hole that is open to two entrances. Like a single tunnel. We never say that a tunnel has two holes.

The colloquial meaning is different from a topological definition. Anything with a through-hole has a hole at each end. It's an ambiguous question because the answer depends whether you're referring to a openings in the face of the object (a cylinder in the case of a straw) or the void connecting the surface openings. Perhaps the safest answer is inclusive, so three. I've been told I'm not fun at parties.