Any guy or girl that you fuck with on the side while in a relationship, anyone other than your significant other. Side sauce commonly does not know you are in a relationship or thinks that you are in a relationship with them.
Heather: "Who's the linebacker with the pretty mouth, is that your boy?"
A golf term coined by renowned golfer Phil Mickelson. Side sauce is that special oomph added to a shot to ensure that it will go in. Usually used in a playful, cocky manner. Can also be used in a general manner to describe a shot made with a lot of finesse and precision that will definitely go in.
Alternatively and originally used as a verb.
"Gonna add a little side sauce to this chip shot. Baby's going right in."
"Pins on the left, and there's a ridge from the right, so the ballwill feed to it. So I'm going to side sauce one in there from the right." -Phil Mickelson on his golf game
A "human" that spends so much time playing video games that their posture is level nerd neck. Everytime anyone goes tryhard they hunch down and their neck gets longer there fore a nerd neck is always hunched down cause they're always going try hard. In other words a nerd neck is a try hard, since their neck is 100% longer than the average human being due to playing too many video games and taking them serious, nerd necks are not even considered human anymore but something more sad. Nerd necks are often found on fortnite, their natural habitat usually being tilted towers.