Jack'n and Jill'n 

Self masturbation while your masturbating arm is interlocked with a partner who is also self masturbating.

It's not gay when you're Jack'n and Jill'n.

Jack'n and Jill'n is like a {dutch rudder}, but you don't need to wait your turn.

Jack'n and Jill'n by Try Hard Anon June 7, 2016

Jack and Jills 

Sexual stimulants known as viagra.

Can you get me some Jack and Jills, I just can't get it up.

Jack and Jills by itsflemz August 24, 2007

jack and jilling 

1. doing both meth and heroin at the same time
2. doing any drug with one's partner

Jack: We were jack and jilling on saturday
John: You did fucking meth? Dude that stuff is neurotoxic...
Jack: No no no. We just dropped acid together. Fuck meth.
John: Ah, ok, I feel ya.

jack and jilling by rudeboycam March 7, 2016