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A word used to refer to a person who is incredibly plain and/or hard to look at. Derived from the noise the sardines on "Spongebob Squarepants" made when they overtook the Crusty Crab (or anytime a sardine comes into the shot); they all looked the same, and were very unpleasant to look at compared to other characters.
While surfing through someone's facebook pictures:

Person 1: Jesus! Have you seen the picture of ___s' baby/kid?

Person 2: Not lately, why?

Person 1: the kid's a fucking meep. Poor thing...
Meep by Texas_punk08 May 18, 2013
The imitation of a birdsound, used when someone says or do something you think is stupid or ridiculous.
Person 1: "Look, I can twerk with no feets!"

Person 2: "Meep..?"
Meep by TeemoSmurf November 20, 2014
The word used when one has no idea what to say or is used to fill silence
Person 1 "soo how was your day?"1
Person 2 "*silence
Person 1 meep.
meep by yeep3000 June 27, 2017

meep mop 

A Meep Mop is a traditional song sung by the Little Snus. Scientists proved that the origin of the song was somewhere around 1833 and in parts of what is now Northern California.
"Hi! Hows that one little song go?" "I said a Meep Mop A Meepy to the Mop!"
meep mop by Dr. Smoofy July 18, 2017
What I say to my friends when I know I need to say something, but don't know WHAT to say.

Also the name of a little alien from an old Disney show called "Pheneas and Ferb".
Brea- "Chey you've been quite since we got here, are you ok?"

Me- "MEEP!"

awkward silence
Brea- "...yeah ok, let's talk about Jake!"
Meep by (• . •) Potato August 10, 2017
meep is when u are high as fuck it hurts so u say ow
m-"hey dude I'm gonna get meeped tonight"
n-"shit man ow"
meep by lmaooooooo1230137x June 14, 2018