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Adjective. Describing and/or referring to a generally sweet, straight-laced, always worrying about the consequences, type A personality, who is just dying to be anything but!

Generally, hangs out with people that exhibit the opposite problem (wild, fly by the seat of their pants, action now/consequence later type personalities) thereby getting his/her "fix" without being implicated should there be fallout.
That girl may give off ultra-conservative vibes, but I bet she is really a SMUP!
SMUP by ImGanGstaLiKetHaT January 15, 2011
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smup by smrt June 28, 2004
Related Words
A puppet with a long and oddly suggestively shaped nose, as well as a rather impudent and jutting plush rump. May be a portmanteu of smut and puppet.
Dave's Bro has an entire website dedicated to smuppets and their plush rumps.
smuppet by inkwellDried September 11, 2011
When something is smart and stupid at the same time, as in stupid for the idea, but smart for the outcome (and vice versa).
SMart/StUPID= SMUPID

A lot of things Freeman did in the machinima Freeman's Mind were Smupid.
Smupid by andkjagyugfjhbm July 31, 2009

Smupleplup 

"You know what they say about people with smupleplup"
Smupleplup by Loominati666 October 15, 2014
A very smart, stupid person. who can be a genius at one time and an complete idiot the next
My dog is smupid
Smupid by Wolfwriter14 December 21, 2016
When u start something thinking it's really smart but ends up being really stupid
Boy thinking I could ride a skateboard at 52 yrs old was really smupid!
Smupid by justme69 February 5, 2018