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1.
When your mother feels so bad for your pitiful self that she feels the need to tell you ridiculously untrue things about yourself.
Of course your mom told you you're the handsomest little prepfag at your private school, it was just a mompliment.
av D. Money 24 februari 2008
 
2.
An offshoot of the popular phrasing/joke "Your Mom" in which the mother is actually complimented rather than insulted. Often includes intricate run-on phrasing/sentences.
Example 1:

Guy 1: I really disliked our tour guide in NYC

Guy 2: Your mom could be a tour guide because I'm sure she has a wealth of knowledge to share with the world to make it a better place.

Guy 1: Thanks for the mompliment!

Example Two:

Girl 1: Wow, I'm feeling burnt out.

Girl 2: Your mom feels burnt out from shining so brightly for all the world to see and enjoy. She is a hopeful ray of light that we could only aspire to be half as luminous as her.

Girl 1: What a wonderful your mompliment!

Example 3:

Girlfriend: That baby looks funny

Boyfriend: Your mom looks funny especially when she's doing an incredible job at comedy where I basically pee my pants and she's so nice that she offers to buy me new slacks because she is the most generous and giving woman I have the ABSOLUTE pleasure to know... except for you baby

Girlfriend: You almost got yourself in the dog house for that slightly awkward and creepy mompliment. But thanks for the mompliment!
av Carl and Lincoln 13 juni 2010
 
3.
A compliment from your own or someone else's mother.
1: I got TWO mompliments today- my mom said she liked my shirt, and your mom said I smelled good!

2: Wow, you sent your mother on an all-expenses paid vacation to Hawaii? You must've been swimming in mompliments!

3. (from a mom) "Allow me to give you a mompliment on your fine manners!"

Also:
Momplimented (having received a mompliment)
Moplimentor (One who gives mompliments) aka a mom
Momplimentee (One who receives mompliments)
av Micvinspi 3 september 2010
 
4.
When your mom, someone else's mom, or a mom-type says something strange to you that is on some level flattering and is said with the intention of being so.
Person #1: best compliment of the day was between yours and my mom telling me that I smell good, like Eggo waffle perfume?
Person #2: that's such a lovely mompliment!
av taycolez 17 oktober 2011