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1.
Being cornered by a co-worker, with no obvious means of escape, and having to listen endlessly to boring stories. The urgency of the situation is proportional to the story - listening to Star Trek or boob job stories requires immediate intervention.
Quick, Alan's pinned down by the water cooler! Page him!
by Marc Bernard March 13, 2006
 
2.
To be trapped in some place
"That fucking sniper got me pinned down behind this wall"
by oroddkw September 21, 2009