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1.
The act of being midway through a stroke.
Stroke referring to stroking the penis.
Steven: OMFG WTF ARE YOU DOING!!
Matt: OMG DUDE!
Steven: Put that away!
Matt: You caught me mid-stroke D:
by MIDSTROKEMATT July 13, 2011
 
2.
The state of being rudely interrupted in the middle of something important.
<Phone call>
"Hey what's up buddy?"
"Nothing, call me back later."
<Hang up>
"WTF was that! I must have caught him midstroke with his girlfriend. Total coitus interruptus."
by sBox November 12, 2009