Something that "hums" (stinks) which also comes from your bum. i.e farting..guffing, trumping...bottom vapours!!!
"Hey what's that awful smell"

It's Andy...he's got bum hum!
by BFREASH February 16, 2010
Top Definition
Something that "hums" (stinks) which also comes from your bum. i.e farting..guffing, trumping...bottom vapours!!!
"Hey what's that awful smell"

It's Andy...he's got bum hum!
by BFREASH February 16, 2010
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