Top Definition
1.Thinking about sex with a girl you see out and about (who looks to be under 18). You think about it, but never act upon it.

2. A coded name for any girl who looks suspicious of being underage and want to alert your friends without putting them on blast and to save them jail time...

(no actions = no felonies = no jail. do as you wish in your mind. create all the felonies you can handle there)
Example 1:

"Dude, definitely just had a mental felony."

Example 2:

Friend 1: "fuck, you see that girl that just passed us?"

Friend 2: "Oh yeah dude. Total mental felony right there."
by Sonic Reducer August 18, 2011

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