A Meep (noun):

A mystical creature which resembles of a rabbit, a baby lamb, a fawn and an alpaca.
Meeps are from a different planet, galaxies away.
Their home planet is called Meepland which exploded due to an asteroid fall.
Only one Meep survived and now lives on planet Earth, she is very lonely and is on an ever lasting mission to find another Meep, to reproduce to continue its species.

The most versatile word in the English language, or in fact any language!

Can mean whatever you want it to mean, but the most popular uses are:
1. An exclamation akin to 'ouch' or 'uh oh..'
2. Filling in the blanks where other (rude) words would go.
3. A greeting! I personally say meep instead of Hello...
4. A random expression of happiness used to fill gaps in conversation.

Meep is the best word ever! Meep!

Meep : Sums up everything.

Isn't it the sound that Beaker from the Muppet Show makes?

Onomatopoeia, one of surprise, akin to a gasp.

An exclamation which can be used for any purpose whatsoever.

Interestingly enough, the religious sect 'The Followers of the Meep' regard the use of the word Meep by any non-Follower as heresy.

This is a word which is used when you are at lack of what to say or just wish to say something random. It's sure to make an impact.

1) a more light-hearted version of the exclamation "eep"
2) a prettyful sound used to fill silent gaps in a conversation