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1.
A spontaneous gathering of an extended group of friends, usually involving alcohol or some other recreational drug. A sponty is generally organised within a few hours of it starting, so as to not detract from its spontaneity.
What are you guys doing tonight?
Nothing?
Sponty at Clare's place!
by Hectic Sponty Krew March 09, 2008
 
2.
A spontaneous gathering of an extended group of friends, generally involving alcohol or other recreational drugs.
Are you guys doing anything tonight? No? Sponty at Clare's!
by HSK (Hectic Sponty Krew) March 08, 2008
 
3.
An immediate arousal of the male sexual organ triggered by a pleasurable sight.
She dropped her drawers and I got a sponty!
by vernon September 25, 2003