Nod your head to a beat. Blast some music and have fun.

to play music on an instrument, by yourself or with others

Pretty much the new "Ballin'" same meaning

in reference to a girl when she is on her period

Chillin out/Hangin out

Means to chill out and relax...relates to the word "cotch"

The common misconception is "to jam" or just keep on playing on an instrument, usually a guitar. Bob Marley sings the song "Jammin'". That jammin' is to smoke up, puff the magic dragon, or the ever so popular, doing it with mary jane.