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1.
To be left hung out to dry, cock blocked, lied to, or otherwise let-down by someone who you were totally counting on.
I had to walk home from the bar because the douchebag who was supposed to give me a ride completely Lonnied me!!!
by TMANN69 November 27, 2011
 
2.
Code nick-name for being under the influence of Klonopin or Clonazepam.
I got so lonnied last night that I fell off a bridge totaled my car and have no recollection.
by Real Mayo January 30, 2009