ninja is the best fortblox youtuber and streamer, he gets 15231 milions subscriberz. He is our roblox lord.
by JAKE PAULER 69 July 9, 2018
Get the ninjamug. 
You’re such a “Ninja” just sittin’ And playing Fortnite all day. Just go out and be with your friends
by ItzMe123Yeah October 22, 2018
Get the Ninjamug. v: to steal sneakily
n: an extraordinary force at something (usually athletic)
n2: an ancient Japanese spec-op
adj: to be as cool as a ninja
adv: to do something in a way that a ninja would do it
n: an extraordinary force at something (usually athletic)
n2: an ancient Japanese spec-op
adj: to be as cool as a ninja
adv: to do something in a way that a ninja would do it
v: Yesterday I totally ninja'd this book from you, here you go.
n: Yeah, Richie's a ninja at dodgeball, he once vaulted Tommy to dodge an attack.
n2: Ninjas are cooler than pirates.
adj: OMG! This movie is freaking ninja! (Yes, I'm talking about Donnie Darko)
adv: Check this out! I can ninja laugh! *does not laugh*
n: Yeah, Richie's a ninja at dodgeball, he once vaulted Tommy to dodge an attack.
n2: Ninjas are cooler than pirates.
adj: OMG! This movie is freaking ninja! (Yes, I'm talking about Donnie Darko)
adv: Check this out! I can ninja laugh! *does not laugh*
by MG1992 September 4, 2009
Get the ninjamug. 
In bicycling lingo, a jogger or pedestrian dressed in dark clothing and no light or reflective gear at night.
by Grizzlybike May 10, 2015
Get the ninjamug.