Cum-on-a-Cookie is a masturbation game that your cum-buddies like to play. Everyone beats their meat, blows their load(s) on Oreos, and the last guy to have his dick-gasm is fed the cookies.

A statement.
You ask your partner this after sexual penetration.
The male that you are fucking then cums on your cookies that just randomly happened to be next to you while the two or 7 of you are screwing.
And you eat the cookies.

When a group of males get together and all proceed to masterbate and blow their loads onto a cookie. The last person to ejaculate has to eat the cookie. Can be also done in a tournement like fashion.

When a group of guys get together and masturbate. They have to cum onto a cookie (hence the name 'cum cookie'). The last person to cum has to eat the cookie.

noun-jacking off into cookie dough and baking it crisp and then serving it to your in-laws.

a type of cookie that instead of milk, it has female or male ejaculation fluids (preferably female) . they are then baked and eaten like regular cookies

An ejaculatory emission from a male sex organ onto a person's tongue leaving a disk-shaped circle of sperm.