Top Definition
falling asleep without no one noticing.
Eman: Hey wheres Don?
Marty: There he is, hes asleep.
Eman: Oh man, hes quick. He ninja napped.
de shortychopo 16 janvier 2011
1 more definition
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"
de cardancechamp24 8 mars 2010

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