What is Grandma Burn?
1.
A 
-Look at this, Grandma!
-Oh, that's just, um, wonderful....?
-Dude, grandma burn!
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1. 
To take a ride in a taxi, and at the end, when the cabbie asks for payment, you run out on the fare. WARNING: It is not recommended that.. 
1. 
Noun. American. 2005.
The condition of being able to see a female's trimmed or cultivated pubic hair through a sheer undergarment...