look up any word, like plopping:
 
1.
The folding of the fabric in the crotch-region of one's pants while sitting down which produces the illusion of an erection.

jopple
Greg was giggling uncontrollably; he was looking at my crotch and must have thought I had an erection during the meeting but it was my damn joppel!
by hobknobber1 March 01, 2011