look up any word, like cleveland steamer:
 
1.
eating a girl out with a dip or chew in your mouth.
i gave that girl a dirty swamp thang last night
by Easter P October 26, 2009
 
2.
Ugly woman who wears revealing clothing with out revealing anything you'd want to see. Most likely to be seen at swimming pools, beaches, or any place where people are gathered in the summer months.
Swampthang's have no discernible breasts, or they have saggy, wrinkled breasts. Stick thin legs and arms, no butts, and faces that look like rawhide.
No dear, its just a Swampthang.
by not even mad. June 10, 2010