Under the pump - for being very busy, feeling the pressure (like that caused when using a pump to inflate), almost at bursting point.
by BVB1 February 14, 2019
Get the under the pumpmug. When you masturbate then do a backflip as you climax so that you ejaculate on your own face in mid-air.
Person 1: "Is that a bit of ranch dressing on your face?"
Person 2: "Nah, I've just been under the pump"
Person 2: "Nah, I've just been under the pump"
by Lord Of All Things Sasquatch November 9, 2020
Get the Under The Pumpmug.