a subversive colloquialism, often used by male friends or 'mates', to comment on the fact that one of the males has captured the interest of some third party, most commonly a sexually viable female

an object or creature that has functionallity comparable to a fish.

Where a man and a woman attempt to have sex with no hands, the man wobbles like a fish on top of the woman as he tries to penetrate the Vagina possible the Anus.

If you wish to know the newest acronym "fish" and what it means. It simply means "Fuck It Shit Happens"

A strategy used by guys for picking up chicks on the beach in which one guy sends the stud in your group on a long bomb route and throws a football into a large group of hotties. The guy running the route will be forced to dive into the group to make the catch, thus landing face-first in the sand. The hotties will be both impressed by his remarkable athleticism and concerned for his safety. Your buddy will return to your beach house with the group of hotties, thus allowing you to pick off one of the looser chicks. This technique was popularized in American Pie 2.

Looking for compliments;
As in fishing for compiments

The act of insulting, or making fun of ones self, with the intention of others dissagreeing and/or complimenting that person.
This act can trigger a birage of different people getting involved, who usually also start insulting/putting themselvs down.

Found most often on social websites such as Facebook and Twitter.