In sex, when a recipient of anal is filled with cum, then cums in their partners or another person's ass
Person one: Yo man I got filled then filled them!
Person two: damn your a real filled injector
by Coomer123 April 20, 2022
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Someone ready and willing to be the driving force with anal sex.
Example: Kevin is an anal injector and Greg loved it.
by Da Honz April 10, 2018
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