When all five fingers are either in the ass or the vagina (but not both, unless you are going for the double)and the person moves his/her hand in a rapid wiggling motion.
Last night I gave Hannah the ol' earthquake until she was loose like a senior citizen
by HannahKraus February 27, 2009
1: the release of seismic energy from the friction between moving plates in the earth's crust.
2: natural selection for Californians.
These damned Californians are getting too numerous... time for another earthquake!
by seismixxx May 07, 2003
a natural phenomenon which is no longer a phenomenon for the people of Japan.
Japan seems to suffer earthquakes as often as Florida gets ripped apart by hurricanes.
by KRHimself March 21, 2005
When you're having sex and your partner has a seizure.
OMG Jimmy totally earthquaked me last night, it was AWESOME.
by Shade696969 April 01, 2009
A prank in which someone shoves a boy or man who is urinating into a urinal, yelling 'Earthquake!'
He gave us an earthquake when we were peeing in the urinal.
by Yarince May 09, 2008
Double fisting a girl and attempting to simulate convergent, divergent, and transforment plate movements inside her snatch.
Kevin, "What'd you and Marry do last night?"

Brad, "Dude I earthquaked her so hard"

Kevin, "Wow man that's hot!"

Brad, "Yeah she'll be feeling the aftershock in the morning!"
by Mike Hunt69 bitch February 01, 2014
During the sexual act of a Golden Gate (see Golden Gate) the tops lean forward over the bottoms and kiss. Thus looking like the towers of the bridge have collapsed.
"Totally banged those chicks last night, didn't we dude!?"
"Yeah, but was the kiss really necessary?"
"Yeah, totally, now we can so we earthquaked!"
by McCourt November 12, 2008

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