the act of napping unexpectedly when the feeling of being tired is not present. should be avoided when operating heavy machinery or driving a motor vehicle. preferably takes place on a couch or another piece of furniture; not to be confused with fainting
"i was just sitting there talking to my friend and all of a sudden was hit by a ninja nap"; "sorry, just ninja napped"
falling asleep without no one noticing.
Eman: Hey wheres Don?
Marty: There he is, hes asleep.
Eman: Oh man, hes quick. He ninja napped.