M-N

No SUH!

"Really?!?" or "What did you say?!?" Often answered with "Ya huh!"

Nizza

Something that is very cool: "I just bought a nizza looking sports car for only $18,000."
John Scaro

Next

When used with a day of the week, to indicate an upcoming day, for example: "Let's meet Friday next."
Michael Howell

Naw

Opposite of "yuh" or "yah."

Na-ah

No way!
Al Donovan

Mush

To welch on a bet or to stiff someone on a debt. "I owe him $20 since forevah; but I'm quittin work, so I mushed him."
R.D. McVout

Morgie's

Officially, Morgan Memorial, but can be used to refer to Goodwill, the Salvation Army or any other charity that picks things up or runs a thrift store.

Moosh

Friend, in the Nonantum section of Newton.
Steven Liberace

Milkshake

Milk with some flavored syrup, but NO ice cream.

Compare to: frappe.

Middla

Third-year student at Nawtheast'n University (a five-yeah school).
Allison White