stick-in-the-mud 

A person who is dull and unadventurous and who resists change.

Conservative.

Her fun-loving boyfriend had become her stick-in-the-mud husband.

stick-in-the-mud by bonmot58 December 8, 2012

stick in the mud 

Someone who prefers to allow things of seeming enjoyment pass them by

Someone who prefers to "stick" (stay, remain) in the "mud" (a metaphor for despression and unhappiness)

derived from "to stick in the mud" ..

The time has come to thicken the blood //
and make no mistake i'm a stick in the mud //

stick in the mud by adhesives April 27, 2003

stick in the mud 

In other words "a killjoy".

Be sure to join in enthusiastically with a sanguine's activities and ideas and above all, don’t be a stick in the mud!

stick in the mud by kaye321 November 22, 2016

stick in the mud 

a stuffy, old fashioned person

Your uncle is such a stick in the mud.

stick in the mud by The Return of Light Joker August 18, 2011

Stick in the Mud 

A person who won't ever let you have fun

Why you gotta be such a stick in the mud?

Stick in the Mud by Smasher6708 May 12, 2019

Stick in the mud 

When you are having anal sex and her shit splatters all over your dick

I waz havin sex with ma gurl and she was sayin if i wanna put my stick in the mud

Stick in the mud by Iluvfatguys July 24, 2020

stick in the mud 

When you tuck your cock back under and poop on it.

I had to pull a Stick in the Mud before I was ready to give her the Cleveland Steamer.

stick in the mud by Chad L. R September 25, 2007