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1.
A nasty ass vagina which has begun to smell like decaying filth.

It is nearly impossible to manage to completely avoid coming across a bumtang at one point in your life.

Often left unnoticed until it is too late.

Also known as a waste-gash
W. Churchill - Well leutenant, did you pound that pussy last night or what?

Leutenant- Sir, i managed to retrieve the pussy but was surprised when it turned out to be a complete bumtang and was forced to retreat.

W. Churchill - leutenant, we all face some waste-gash at one point in our lives, but when going through hell the best thing you can do is keep going.
by Megalow February 16, 2010
 
2.
when someone is perfoming anal sex the bit of the penis left out of the anal passage is the bum tang
yeh i was conciderate so i left out the bumtang
by running out of names here February 07, 2007