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1.
The act of procrastinating, even if it means doing something you usually would not want to do ie. doing housework, feeding pets etc. Named after a popular Hagaren character, Roy mustang for obvious reasons.
Hawkeye: Sir, please stop cleaning the windows and get back to work.
Mustang: I am working! I'm.. MUSTANGING!
Hawkeye: ... You. Work. Now.
by Jiah June 07, 2005
 
2.
dancing like a stripper with co-workers
Eric was mustanging it at the Jack Daniels saloon last weekend
by LZD June 16, 2008