When someone with a big bum, swallows things in there bum.
(teacher with a big bum playing badminton)..
"OMG.. she's going to turn around and catch the shuttlecock with her bum!!, Now I know what they mean by butmunch!"

"omg, Shes short..Her bum must have ate her height"
by SKRM March 22, 2009
Get the mug
Get a Butmunch mug for your girlfriend Nathalie.
Is a person who is really annoying and abnouxious, slacking off to another person.
Say a person was really annoying to you and abnoxious won't leave you alone because they where slacking and goofing around touch to go hangout with friends and their the ButMunch.
by Random85 April 04, 2014
Get the mug
Get a ButMunch mug for your Facebook friend Vivek.