huge, massive, earthshaking
man, last night was seismic
by jack79 January 25, 2007
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The foremost type of exploration carried out in the search for oil and gas. the theory behind seismic exploration is a energy source on the surface making seismic waves that reflect off the oil reserviors and are recorded at the earths surface by sensors.

In land exploration the source will be either dynamite or a fleet of vibrators, in marine the source will be airguns. The sensors vary widely in type, but all have the same function as a microphone.
The seismic crew fucked up another startup.
by dude_zeon June 18, 2004
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A racist person who yells the word faggot.
The seismic shouted, "Shut the fuck up you fucking faggots and shoot them in the brain!"
by CS gamer April 19, 2004
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Thinking that earthquakes revolve around you.
From Rhett & Link's Good Mythical Morning.
Link: 'I will gladly accept being a Ego-Seismic, wherever I go earthquakes flee!'
by H3NR7 March 5, 2012
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the belief and/or personality that wherever you are or live is immune to earthquakes simply because you are present there
Link has an ego-seismic personality and thinks that the only reason North Carolina never had an earthquake when he was there simply because he was present.
by GiantPandaKing June 11, 2012
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A sexual act in which the male gyrates his pelvis in a rotating motion while recieving oral sex.
"Dude, last night I gave my girlfriend a seismic toss while we were listening to Prince!"
by Master Machoke February 13, 2009
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An earth shattering fart so disgustingly raunchy and ratchet that one must feel bad for the chair and/or wall that once stood, before the catastrophe occurred. In some cases the 'Seismic fart' can destroy an entire study session, leaving behind trace amounts of fallout that can last for days.
Devin: Hey Luke, what was the atomic weight for Germanium?
Luke: Oh yeah it was --
*Seismic fart rips through the air*
Luke: Never mind that, we need to search for survivors now!
Devin: agreed!
by lucky spice February 6, 2013
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