Ninjaculation 

The act of ejaculating on another person without them being aware of said act.

I earned my black belt in ninjaculation last night when I popped one all over Cindy's face while she slept.

Ninjaculation by pseudomine September 8, 2011

Nojaculation 

The act of beating off vigorously nonstop and not busting a nut

tom: when ever it beat off nothing comes out

Doctor:extreme case of nojaculation

Tom: NOOOOOOOO!!!!

Nojaculation by the gumaster June 26, 2012

injaculation 

Injaculation is sticking 2 fingers on your PC muscle near the anus to keep semen from coming out during the orgasm. The semen is pushed back into the persons bladder, prolonging the orgasm and causing some painfull pissing in the morning.

injaculation by 2nd seal February 18, 2003

injaculation 

1. To ejaculate in the opposite direction (inwards)
2. To receive ejaculated matter into oneself; to be injaculated

Origin unknown

I had the worst injaculation the other day, it all came out of my mouth at the end though. So I'm fine, what's up with you?

injaculation by retarded smurf May 31, 2004