Doing something that normally has an agreement between 2 parties with a secret 3rd party. Unbeknownst to one of the 2 original parties involved. This can include under the table business dealings to gain an increase in funds without a person who you have an agreement with knowing so they never ask for a cut of the profits. Also can be used as a synonym of cheating on one's boyfriend/girlfriend/spouse.
I know this one guy who is always doing side deals and thinking that he will get away with it well I know about it and I better get my cut or he will not have a good day at all.
by Ukonvasara January 14, 2012
When after a night of drunken sex you are too hungover to perform any acts with your partner aside from some lazy hand stuff.
We were pretty raunchy last night, but man this morning those Rye and Gingers really set in so I had to give her the ol' Midland Side Deal.
by Lbendy33 October 23, 2022