When you stick yer finger up a chick's poop chute, hop on her back, stick yer finger in her mouth, and give the 'ol fish hook.

It's the sweat that accumilates under big boobs

When your doing a girl doggystyle, after inserting your finger in her butt, you reach up and fish hook her. All while saying "Got one on the line!"

When you surprise someone with a variation on a Wet Willy ... but instead of wetting your finger with your mouth, you wet it with your butt. And instead of putting it in their ear, you put it in their mouth.

While making love doggy style, you stick 2 fingers in her asshole. Then remove the fingers and reach around to her face, in one swipe wipe her upper lip with your index finger "Dirty Sanchez". With your middle finger simultaniously hook the inside of her cheek "Fish Hook".

Curl your finger like a fish hook, stick it into someone's anus, and quickly pull it out.