1) - Talking on and on and on without saying much of anything of substance.
2) - Spending way too much time telling people how wonderful you are
Other versions: "Yak Off" and/or "Yakked Off"

Spending countless hours on the social media app "Yik Yak". Much like jacking off, it can be an extremely pleasurable activity.

you allready know

A blow job with your teeth

The maneuver of bringing your balls up over on both sides of the penis and then tucking your penis. While wearing tight pants it (your bulging testicles) appears as a yaks hoof or "yak paw." This is a complex and sometimes painful maneuver that should only be performed under extreme circumstances.

An alternative humorous word that replaces "bull sh***" that can be used by an age range. A yak does resemble a bull and saying "poop" is better than saying "sh**". This is not a curse/swear word.

It's when you eat an onion to make your cum thick.