When someone is doing, saying, or thinking something very stupid, something that cannot be explained or justified with reason.
Jamal: Man, Tyrone I wanted to go to the movies with you. I thought you was in Hawaii.
Tyrone: Brotha, I been snapping you all week. You niching.
Tyrone: Brotha, I been snapping you all week. You niching.
by wutangclanaintnothintofuckwit August 31, 2015
Get the Nichingmug. The area of skin on the backside of your knees. This area is commonly suceptible to sunburns especially to gingers. Similar to the reverse side of your wenis aka a wiche.
by Sammsizzle September 9, 2010
Get the nichesmug. Niche (Ni-ch)- Your personal space.
by HHP June 8, 2003
Get the nichemug. Usually refers to a small penis
by Jimmy John  December 21, 2016
Get the Nichmug. Someone who over exaggerates everything, lies/fakes things and then is a complete hypocrite about his own actions. An all around cunt bag who doesn't show up to planned events he agreed on participating in.
by Hypnotic Loafer April 7, 2017
Get the Nichmug. 
Get the Nichmug. 