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1.
literally "many of them"; only said by the proudest of "yah-doods" in the greater Boston area.
"Yo dude, did you see all those fuckin' broads down at Sully's, kid?"
"Yah, dude! There were MAD of 'em!"

or

"I heard there were mad cops down at the beach dude."
"Dude--there were like five...fiftee...ffffuckin'... mad of 'em, kid."
"Wait, how many?"
"Fuckin' MAD of 'em."
by Tausevich April 14, 2010