Jack in the boxing 

To masterbate at work in a cubical or perimeter guard kiosk.

The officer was caught jack in the boxing in his guard kiosk.

Jack in the boxing by Got caught January 16, 2014

Blanket boxing 

When someone is jacking it so hard that it looks like they are boxing the blanket

"I wanna be a blanket boxer when I grow up", said Johnny.

"I really need to stop leaving you home when daddy and his friends are drinking" sighed his mother

"You would never guess what Matt was doin when I walked into the room." "Lemme guess, he was blanket boxing." "How did you know?" "Cuz he loves men"

Blanket boxing by Badbrehm May 26, 2013

Boxing Day 

Thanks to Alexander V. Boxing, for holding the first “Boxing Day” Sale in his Montreal haberdashery December 26, 1818, the day after Christmas, thus creating a new Canadian Holiday Tradition.

I’m going out for some great Boxing Day sales!

Boxing Day by HereBeDefinitions December 26, 2018

boxing

to fight with fists or with padded gloves in a boxing ring

I had to give up boxing when my opponents kept getting their gloves caught in my stomach.

boxing by yorrick hunt January 23, 2008

boxing the clown 

Jerkin off

What? so you're gonna sit at home boxing the clown all night?

boxing the clown by muthafuckinhol January 11, 2010

cervix boxing 

pumping so hard that the fella is pounding or "boxing" the cervix

He had my legs over his head and got to cervix boxing so hard I had to stop!

cervix boxing by Anonymous July 31, 2003

pink boxing glove 

When you’re fisting your partner and it goes horribly wrong, resulting in your partner’s rectum being pulled out and remaining on your hand like a glove.

“I got a bit too rough my partner and ended up with a pink boxing glove.”

pink boxing glove by jubbajubba October 1, 2018