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To thravish something means to destroy something but in a good way. It can also used to describe physical damage to something. However, its most popular use means to completely dominate and screw a girl really well in bed.
Instead of saying f*cked the shit out of her last night, you can say, "I thravished that ass last night."

Other examples:

My goodness I'm so hungry. I'm about to thravish this pizza.

Omg she's hot! She would get soooo thravished!

You see a car accident where a car is totaled. You say, "omg that car got thravished!"
by Crazy Square June 23, 2011