1. a
cool/excited
way of saying "yeah!" or "of course!" short for "shit yeah"
2. can also be used in a sarcastic
way, as used in the movie 'Waynes World'
1. "You goin' to Mike's
party?" "SHYEAH!... I can't wait!"
2. "You goin' to Mike's
party?" "shyeah, right... and later on, monkies might fly outa my
butt"