to pull/do a lynch refers to the last minute preperation before an exam, lessons, show, whatever.
to a lynch, the preceding night to a deadline will undoubtedly have been spent smoking, drinking, napping and subconsciously stressing. inevitibly someone doing a lynch will go to bed at 4am and get up at 6am to prepare work for a 7am deadline.
you pulling a "lynchy?"
you did a "lynch" didntya?
oh i cant be arsed, im gonna do a lynch.