Australian slang for a penis, neatly encapsulating the description of how that part of the male anatomy shoots with great force a fluid that ever-so-slightly resembles a globular, liquid dessert.

Also Custard Gun was the original name of the legendary 1990s Brisbane AU band Custard: name truncated for obvious reasons!
I drizzled my gf's donut with a healthy glaze courtesy of my custard gun. Mmm!
by Bag O'Turnips April 14, 2008

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