What is Tuck Up?
1.
The act of trying to hide an erection by tucking your penis into the waistband of your pants. This method is usually used when in public and/or wearing loose fitting pants or shorts.
I got an erection while staring at that woman but i was in public so I had to tuck up.
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2.
To shaft or prank someone, usually a mate. As seen on some of the WKD adverts
You tuck up a mate, when they can't get away from someone talking to them and you don't rescue them.
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Random Words:
1.
The act of intentionally expelling explosive gas into the cushions of your friends couch, making sure not to move or shift your buttocks..