The opposite of the traditional "slamma jamma", aka. sex. You flip your partner around in any direction you choose, without pulling out, and continue giving it to them. Instead of being slamma jammed, your partner now gets jamma slammed!
Adam: I was slamma jamming that girl last night, but she kept talking about Scientology.
Paul: What did you do about it?
Adam: I flipped her over, and started Jamma Slamming her! It felt great.
{fy-jahm-mah-slahm-mah} noun, 1. a physical fight or altercation involving a large number of people - usually involving weapons such as bats, sticks, knives, brass nuckles, etc. 2. a rumble
We're getting ready for tonight's fi jamma slamma. Are you in? If so, bring a weapon.
Last night's fi jamma slamma involved more than fifteen people - with three being hurt badly.