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1.
To self-seize one's "manhood" from behind and underneath with agression.
"Man ohhh man, I pulled a muscle when I langussed myself last night, Jim"
by Bobby M August 25, 2005
 
2.
a lovable but indescribably awkward friend who frequently partakes in breaking other peoples things, awkward silences, and overstayed welcomes.
He was in the shower with her for over an hour and didn't get it in, damn he's such a langus.

He got too high and broke the bong, dude's such a langus.
by Paper Towelie February 13, 2012