The flow of blood into your biceps after pumping iron that makes them look a lot bigger. Often referred to by Arnie as equivalent to an orgasm.
Having 'da pump' is like having sex. I train two, sometimes three times a day. Each time I get a pump. It's great. I feel like I'm coming all day.
by Canta Kez July 14, 2006
by Pat Egan February 24, 2008