Top Definition
A term collectively used by the fans of New Kids on the Block to describe the NKOTB members' accents when they speak. Being from Boston, the band members have distinct accents that the fans have embraced and even mimic to an extent.

Practically any word ending in (-er) or (-ar) can be translated into Bostonese by replacing the suffix with (-ah), such as in "glittah" "sweah" or "bettah."
Bostonese: Joey Mac bettah be tweeting on Twittah tonight, or I sweah I might have a heart attack!

Plain English: Joey Mac better be tweeting on Twitter tonight, or I swear I might have a heart attack!
by Amos238 June 10, 2009

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