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3.
Used to describe when someone tries to elevate themselves and ends up exposing their ignorance (or flaws, etc).

The further an unsuitable person is promoted, the more obvious his inadequacies become. In various more or less polite forms.
"Way to show your ass, broham. You really are an Internet Tough Guy. "

The filthe of her foli aperith more, as the filthe of the hynd partis of an ape aperith more, whanne he stieth climbs on high.
- c 1395 Wyclif Bible (1850) Proverbs iii. 35 (gloss)

He doth like the ape that the higher he clymbes the more he shows his ars.

-c 1594 Bacon Promus 102

The higher you climb, the more you shew your A—.

-1743 Pope Dunciad iv. 157 (note)

The higher a monkey climbs, the more he shows of his tail. - various
by Harry_Manback October 18, 2009
 
1.
To act like a complete idiot.
by Hotobu June 30, 2003
 
2.
making yourself look like a jackass or an asshole, being a dick. embarrassing yourself or the people you are with in public or in front of other people, usually by doing something socially unacceptable. exposing your true colors in a negative way. also, having a nasty attitude in a public setting.
When my husband started that argument, yelling all our personal business while we were out in the street, he didn't do anything but show his ass to the neighbors.

when you decided to dance with that tramp instead of your girlfriend, that's when you decided to show your ass.
by Viral_Insanity April 27, 2010