a word that typically is
said after somthing impressive or remarkable has been stated. Usually something funny or witty.
what some might describe as a "high five moment"
it usually means - to emphasize the last
thing you
said.
buti it can also be used for no reason at all just to get some attention.
"i just
totally shot this guys head off".."heyoo"
"You
know that look women get when they want sex?"
"No!"
"Me neither!".."heyoo"
(someone waving in the backround shouting):"heyoo!"