characteristic of a type of slapstick comedy in which a performer throws a pie in another's face: popular especially in the era of vaudeville and early silent films.
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British Dictionary definitions for custard pie
a flat, open pie filled with real or artificial custard, as thrown in slapstick comedy
(as modifier): custard-pie humour
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012