The act of BBW women bounding her ass on your tongue in such a rhythmic motion that it looks as though there are seismic waves on the surface of her posterior.
Sentence: "When I Seismic Salad Tossed Tiffany it was like a 9.8 magnitude earthquake on her buttcheeks"
by GenralGrave June 27, 2015
Steve: "We never get earthquakes here!"
Paul: "We will now, I just moved here."
Steve: "You are so ego-seismic."
Paul: "We will now, I just moved here."
Steve: "You are so ego-seismic."
by Mariah444 March 05, 2012