boshetunmai 

An adjective. A slang word for use in place of such words as "cool", "awesome", "crazy!", "evil!", "great!", "rad!", "Viktor-Tsoy-related!", etc.

The Crazy Sushi forums are so boshetunmai!

boshetunmai by One Who Is Boshetunmai March 28, 2003

boshetunmai 

other variants may include
"be worthy" or "don't sell yourself"
(reported to be translations from Mongolian and Korean)

"Boshetunmai!" can be used alone

boshetunmai by Mavra January 4, 2004