That’s just what I supposed the parent comment was referring to by missing an apparent joke as a kid.
Thus my uncertain question mark. I suppose the OP could clarify their personal revelation.

I agree in doubting that Gary had any intention for such an interpretation, simply depicting classic absurdity instead.

However, anatomical and impossibilities aside, you can’t say that sexual slang is well known for it’s grounded realism.
Eating or choking on pussy isn’t exactly an uncommon euphemism, especially those who love to boast about their face-sitting escapades.