underaggerate 

To exaggerate negativly a quantity for the purpose of self promotion.

John : My car does 0-60 in only 5 seconds!
Johns friend : Don't underaggerate its more like 12.

underaggerate by Owen Cox September 8, 2008

Underexaggerate

1. To not exaggerate something that is too epic to be stated as simply as what it is in reality

2. To not exaggerate enough sarcastically (used commonly in fratire )

1. Awesome guy: Maddox is the bomb! \m/
More Awesome guy: Don't underexaggerate man!
Emo guy: I'll cut my wrists

2. Maddox: Celine Dion is an over-paid, over-cafeinated, botoxed bitch incapable of singing to humans.
Another awesome guy: Don't underexaggerate

Underexaggerate by maddoxlover(guessedbynow) December 3, 2011

underagerate 

to minimize something's importance

Don't underagerate my love for you.

underagerate by Bev Bajgot December 15, 2008

underagerate 

when you underexaggerate something.

Father: Your mother only left me two sausages.

Mother: Don't underagerate! I left you at least six.

underagerate by YubaW June 18, 2010

Underaggeration

The opposite of "over exaggerate".

To claim something is a lot less/smaller than it really is.

Can also be used in the forms "Underaggerating" and "Underaggerate"

Kathryn: How much do you get paid?

Darren: GYFNO

Kathryn: Come on, tell me. You know I'll find out anyway.

Darren: If you must know, $70,000 per year

Kathryn: That's the worst case of underaggeration I've ever heard!

Underaggeration by The Noam Gnome August 27, 2011