To completely bail out on a planned event at the very last possible second using the most ridiculous excuses.
-Hey I thought you were coming to the game tonight but apparently you pulled a Chinsy.
-Richard had a huge hard on to go out with Sandra but at the last minute she Chinsy'd him because all he wanted was to get in her pants.
-Bob had a Math test but he didn't study for it so he said "Fuck it, im pullin a Chinsy"
-Billy had plans to pleasure his boyfried Mike anally but at the last minute Mike called and dropped a Chinsy.
-Billy had every intention to win the race but his car pulled a Chinsy at the finish line.