mad of 'em 

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."

mad of 'em by Tausevich April 14, 2010

a mad of em 

a shit ton.

We drank like 50 Steel Reserve 40's this weekend, there were empty bottles everywhere...a mad of em.

a mad of em by Stonefoxsmokey April 13, 2010