1 definition by Rylock

(n). 1. When a male gets physically aroused while suffering from swamp ass, his member is known as "swamp thing."
2. The event of being sexually aroused while suffering from swamp ass.
I was riding my bike when this ultra fine girl walked across the street and gave me "swamp thing."
by Rylock May 5, 2008
Get the swamp thing mug.