Top definition
When you are sitting between 2 people on the subway or bus and you cannot move your arms, like you are in a straight jacket.

Inspired by Stefon from Saturday Night Live, who coined the term Subway Sleeping Bag.
The train was packed this morning! 2 people sat beside me so I got stuck in such a subway straight jacket!
by rebmacandcheese January 17, 2013
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