The act of beating your penis so hard that in the end it turns a pinkish color, thus looking like a piece of ham. Best results come from using both hands at the same time since, they cause more friction.
I was Ham Slamming the other day at work and my boss walked in and joined me. I ended up quiting my job a few moments later.
Late night fornication with a petite skank. Were the filthy animal gets blown out by the ham with the intention to leave her rough, rugged, and raw. A real nice one-night stand.
I had the german soldier marching last night. She was riding the balony pony to heaven; I was slamming ham.