Slipping her a length 

To have consenting sexual intercourse with a woman, to penetrate the vagina with the penis.

"Did you see Glenn Beck interviewing Quitter Palin on Faux the other day?"

"Yeah, he was a complete and utter quittergazer, I've never seen anything like it. It was almost as if he thought she made sense. He was just staring into her eyes as if he was caught in some kind of spell.

I honestly thought he was going to pull down his trousers and try slipping her a length."

Slipping her a length by Arlo Barlow August 28, 2010

slipping the tounge 

this is pretty self-explanatory.
I have no idea why Dawn felt the need to define it for us.

Slipping the tongue = Slipping the tongue.

slipping the tounge by *tt December 19, 2002

Slipping one past the goalie 

To fuck the chick in the ass and for the cum to seep out of the bum hole into the vagina

Friend: I heard you slipping one past the goalie during anal sex
Guy: Yeah, Sheila is pregnant now.

Slipping one past the goalie by Cox in ya mouf November 28, 2021

slipping the johnny

inserting one's hand into one's pants and rubbing their genitals prior to greeting a fellow homie, player, bitch, or ho by the shaking or slapping of hands

oscar: dude who was that
kevin: oh that was that bitch fred
oscar: didn't he steal your fries last tuesady?
kevin: yeah
oscar: what did you do about it?
keving: before we shook hands i slipped the johnny
oscar: dude youre a fucking tard

slipping the johnny by steven bobeven March 31, 2005

Slipping on Crayons 

(1) to be high, (2) to be on a big time trip

When I got back to the apartment, I found my roommate licking the cats butt while sitting in a bathtub full of cottage cheese and orange juice. He was slipping on crayons, big time.

Slipping on Crayons by MC, Tabinator and Lickin' Lia' October 17, 2008

Slipping Off the Hobby Horse 

Meaning to relapse. Also someone trying achieve something but is failing to do so. Often referring to how someone is doing in there life overall.

Danielle keeps slipping off the hobby horse, she can't seem to get it together.

Slipping Off the Hobby Horse by Jeff Sley December 16, 2011

slipping dog kisses 

Kissing while gradually falling to the ground with continually spreading legs.

Tina was so drunk Friday she was slopping slipping dog kisses on that dude outside the bar.

slipping dog kisses by Dave Kurkpatrique February 7, 2014