1. The male medical marvel for reproduction and glee (aka penis/jaint)
2. Any unspecified noun.
3. An exclamation of joy or excitement.
4. Celebratory greeting.
Originated in the Northern Counties of Virginia.
1. Just the first date, I ain't trying to get her all up on my jamtop.
2. Can I borrow your jamtop, mines out!
3. Sega Genesis? JAMTOP!
4. Yo, wud up jamtop? Let's start this party with a bang!