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1.
When you take off running for no reason.
Damn! He sure did Gump it out of here.
by TacoBox February 19, 2009
 
2.
To "Gump It" is to Ejactulate at the site of a Sexual Organ. Such as in the movie "Forest Gump."
Oh My Gosh! Patrick had to Gump It when Samantha took off her shirt.
by Stevosux211 November 21, 2007