The final part of turd that will not fully depart and regardless of how much toilet paper you use, it continues to draw its mark.
I ran out of loo roll last night. Damned bum crayon!
by Stan Ton October 14, 2011
When you've been to the toilet no matter how much you wipe there is still poo there
OMG i've been wiping for 20 mins and this bum crayon is not going anywhere!!
by crazy co-op lady September 24, 2009

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