1 definition by teacherdude32

Top Definition
the last turn on a bolt or nut, so as to insure it will not come loose.
Noun: Okay, make sure you give those lug nuts a good gronk.

Verb: Gronk on those bolts so they don't vibrate loose.
by teacherdude32 August 04, 2009
Free Daily Email

Type your email address below to get our free Urban Word of the Day every morning!

Emails are sent from daily@urbandictionary.com. We'll never spam you.