To be in a state of intense excitement.
"Mate, I'm so excited about that concert on Saturday, I'm practically fizzing at the bung!"
by GingerNinja August 23, 2006
for a woman, to be in such a state of sexual excitement, that her twat is leaking
Britney was so hot for me she was fizzing at the bung, man.
by Sheepshagger July 17, 2006