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1.
The act of receiving a gummer (no tooth blow job) while defecating.
"yo, you're grandma's a pro at giving out gumpkins!"
by someguy3692006 August 02, 2006
 
2.
The act of performing oral sex whilst secreting waste from the anal orifice. The cousin of the more commonly known blumpkin.
"If you don't eat my shit, i'm gonna give you a gumpkin.'
by Pat & Anthony October 23, 2009