Mustard Mitt 

A phrase people say just before admitting to something.

Simon: Mustard Mitt, Andy looks good today.

Mustard Mitt by Pogoextreme October 21, 2020

Mustard Mitt 

When a man ejaculates into a glove before making his partner wear said glove for an extended period of time.

I just mustard mitted my girlfriend all day!

Mustard Mitt by Small_Poxford_Dict November 18, 2022

Mustard Mitten 

When you and a friend (or complete stranger depending on your level of depravity) hold hands below a public bathroom stall divider while urinating simultaneously.

Oh man I just had a mustard mitten three way with Shelley and Karen. It was liberating.

Mustard Mitten by The Mustard Mitten October 18, 2019