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The act of ejaculating into another person pre existing ejaculation.

This can be interpreted as gay depending on who you ask.
The gang are halfway through a game of soggy biscuit

Ewan is the first to ejaculate because he is horny

Joe performs Spillary in Ewan’s semen.

Ewan: What the fuck bro that’s gay!

Joe: I know (rapes Ewan’s balls)
via giphy
by Grant Hansen July 01, 2018
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A horribly unattractive skank-succubus who is now spreading her deceitful rhetoric over the sex organs of one of your best friends. She may or may not possess a vaginal aroma pungent enough to ruin a short car ride. Also claims to be a feminist with no real understand of what that actually means. Doesn't eat meat, but will enrage you to the point of stuffing her consistently open mouth with something horrific to stop the talking. WAY TOO MUCH TALKING.
Dude, Steve hooked up with another Spillary at the bar last night. Now his car stinks.
by Nottobesuccubussed0857858 August 16, 2010
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