A "Dub" is also a abbreviation for a Dublin man.
As in, Dublin, Ireland.
"I'm a true Dub"
"He's a true Dub wearing the blue"
to record a track about somebody this only refers to mcing.
"blud im gna dub da bwoi uno!"
verb
to mess around wasting time with something not important. To idly do things with the intent of passing time, or to avoid doing something productive.
What are you doing up there? Don't you have homework? You'd better not be dubbing on the computer!