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1.
Anything gas, liquid or solid that come from the bum.
Whats that funny smell? Sorry ive let slip some bum rubbish.

I had a curry last night and its caused me to have runny bum rubbish.
by Wolfman99 September 22, 2008
 
2.
Ones excrement. The produce of your caboose. shit
'OH for fuck's sake Tom you've gone and got bum rubbish all over your grandfather's Honda Civic. Lick it up now or i'll have you recycle all your turds from now on!... Good boy. Thats right, lick that shit. Hey Tom? Now that your licking stuff, why don't you try and lick your mother? I'm getting kind of wet here watching you...'
by Pattles August 31, 2008