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It is slang for having sex.
Gurp is a slang term for oral sex. When a girl performs oral sex on a guy, the act is called a gurp.
Slang term for oral sex.
Nuke is a slang term for nuclear; as in the atomic bomb.
Erection is not a slang term. It means that the penis is erect.
Horny IS a slang term. It means you are in the mood for sex.