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1.
Hanging around, relaxing in a somewhere.

Used mainly by children and teenagers, and sometimes by young adults.

It is a mixture of Jammin and dossin, which both mean to hang around or relax/chill in a certain place. Although dossin is usually associated with slacking off, e.g. "the youths were dossin outside the shops".
Dave - "Hey Ricky! What ya doin man?"

Ricky - "Im just jam-dossin blud!"
by Chris-H June 01, 2009