Jean Jammin 

dry humping, a favorite past time of high schoolers and those waiting for marriage, jean jammin does not require participants to be actually in jeans, any fabric seperation is acceptable, but of course the "double denim" jean jam is a classic and feared by all men

I was trying to get with this ho, but we ended up just jean jammin for like 2 hours and my shit was raw

Jean Jammin by Jason H April 22, 2004

jean jamming 

Dry humping with your clothes on.

So did you get laid last night? No, just some jean jamming. Man, my dick is chafed!

jean jamming by jrjohnson78 July 30, 2008

jean jamming 

Dry humping with jeans on. Often causes irritation and chafing.

Justin Timberlake at 2011 Spike Guys' Choice Awards: "are we going to spend 2 straight hours jean jamming them until chafing occurs and we have to walk all funny for 3 hard days?"

jean jamming by 51westside July 9, 2011