Sneak up on one cheek 

To discreetly fart while in a crowded place.

"If I sneak up on one cheek, hopefully no one will hear me fart."

Sneak up on one cheek by creedmoor November 22, 2004

going off on one 

Idiom (UK), see go off on one. To launch into a rant or lengthy discussion about some pet subject.

Might be derived from "going off on a tangent", but has more of a connotation of annoyance.

Sorry for going off on one, but I really feel strongly about this.

going off on one by Cedders March 13, 2011

Off on one 

To behave in an extreme, inappropriate manner in response to provocation.

When he heard he just went 'off on one' and wouldnt stop ranting for several hours.

Off on one by terminal.eight March 14, 2006

Five On One Basketball 

Five on one basketball is the act of masturbating. Since your hand has five fingers(generally) and you use your hand to masturbate(usually), the term was coined.

Man, when I'm stressed out, I get in a good game of

"five on one basketball" and I feel much better.

"Hey, did you and that broad have sex last night?"
"Nah, she got me all worked up and left, so I got in a good session of 'five one one basketball' to cure my blue balls"

Five On One Basketball by Headuardo December 17, 2011

im on one 

trippin off of something; high off of drugs or drunk; overly happy for reasons no one else knows

I'm on one dog, that X got me in the zone

im on one by that dozen April 30, 2005

go off on one

To be provoked by someone/something to such a point that a verbal reaction becomes inevitable.

Why's that kid shitting on Tom's car? Tom's gonna go off on one in a minute.

go off on one by Manson April 27, 2005

five on one 

What G-Unit members do to Fifty Cent when they are horny.

Hey Fitty, here's your 2 quarters, bend over, time for a Five On One...

five on one by TruthMaster August 30, 2006