A violent siezure (of the sexual masturbatory sort) usually occuring around a group of unsuspecting males. Studies have shown that this type of siezure is carried out mostly by virgin yet sexualy mature teenage males.(Actually a siezure in females is yet to be seen.) To help someone who is suffering at the moment of this type siezure saying remarks like, "MAN, THAT IS SOME CRAZY $H!T" has been proven to stop the siezue from imediately reoccuring. There is no known cure. As a matter a fact no one is looking for one.
As I was singing in the school band I watched Clarence reach his right hand into his pants so I decided to looked away as he suffered from a sad yet violent vandergasm.
by mr.calypack May 27, 2011
Get the Vandergasmmug.