A large amount or abundance of something.
We smoked a bunchy lot of blunts lastnight.
A bunchi is an irritable bump which occurs in peoples hair when it is tied up. It generally happens with long hair when it is put into e.g a high ponytail and hair bumps sprout out of the head.
*Tying up hair*
"Jane there's a bunchi in your hair,"
"ugh not agin! now i have to redo it!"