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1.
Can't figure something out, miffed, dumbfounded, confused or don't have a quick response to a situation or something said to you.
When Teresa showed up at the club with her sister and started asking me if I had slept with her, MAN, I was straight up stumpin'!
by JoeP. May 10, 2007
 
2.
verb:
1.the act of posting up behind large objects as if waiting on somebody;

2. The act of being on ones knees
1. Damn look at my man stumpin behind that statue.

2. That girl is always down for some stumpin.
by Sean Stewart May 11, 2008