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A rather crusty anus.
She was enjoying it until i had her lick my crumbfunnel.
by BarryMotherfuckingChuckle April 18, 2011
When eating a slice of cake from a paper plate, upon completion, and subsequent satisfactory mastication, the plate is rolled into a tube-like shape and used to funnel the remaining crumbs into ones mouth. Thus, a crumb funnel is born.
This cake is delicious, Samantha, forgive my use of the crumb-funnel!

Tommy had a great time crumb-funneling the remains of Georgina's Victoria sponge!
by Chinza_mcgru January 03, 2012