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2.
To be pregnant. It comes from the physical appearance of the female's stomach being "pumped up" like a balloon or another round object filled with air.
To be used in the same manner as the word "pregnant":
"She has gone and gotten herself pumped up!"
"Carla is pumped up!"
"When are you going to get pumped up?'
by Niki Yo October 04, 2010
 
1.
to have erection
Oh, I'm pumped up!
by cisar June 17, 2009