Nightbus 

Refers to something that is dark, painful, melancholy or grave in nature.

Word usage stems from various television dramas in which a character is seen alone gazing gloomily out of a night bus window, eg. Joan on Mad Men taking the nightbus home after visiting an abortion clinic.

Chopin was the most nightbus composer.

Nightbus by Vladimir Vladimirovich Putin November 1, 2010

Night Bus 

If you have to have to ask you will never know

dude that's so frickin' night bus!

Night Bus by I voted for Hitler!!!!! August 14, 2010

Night Bus Dance

The dance you decide to have that makes you miss your last train home.

We were out having a shocking time when Norman thought he noticed a hot chick giving him serious cut eye on the dance floor. Norm suddenly got excited and pogo-ed onto the floor, knocking into people and causing a domino effect. 15 revellers toppled over into a heap. Furious, the hot chick toe-punted him in his tip and threw her Tahiti Ticker cocktail in his face. The bouncers dived on him and proceeded to batter him with bicycle chains until the ambulance arrived.

We got into an all-against-all brawl on the N25 home. I was taken to the London Hospital in a Police helicopter!

Fucking Norm and his Night Bus Dance!!!

Night Bus Dance by Surf Biffin September 5, 2007

Night Bus Friend 

A fun-loving friend or associate who favours staying out on an evening even after the most convenient form of public transport has stopped running

"Did Bob get the Tube home after the pub shut on Friday?" "No, we went to a club until 4am. Bob's my Night Bus Friend."

Night Bus Friend by LastOrders March 12, 2009

Nightbutt 

A term used to describe Nightbot on streaming platforms like Twitch. When this chat bot behaves in a way that is unintended or becomes irritating at times during live streams, the bot's name quickly becomes Nightbutt. Aside from being a butt once in a while, it's a solid tool for live streamers by providing a wide range of features for moderation, automation, and entertainment.

Oh, come on, Nightbutt, you're acting up again. Nightbutt, why are you being mean to Bob? Bob's just trying to use some emotes in the chat.

Nightbutt by BlameNick September 11, 2018

nightbuying 

When you buy something off of amazon at night when you're sleepy and you hardly remember doing it.

"I can't believe I was nightbuying 8 Avengers tickets in Las Vegas when I live in LA"

nightbuying by NotMaaike June 4, 2018

NightBuck 

A super human who is human by day and buck by night. he hunts hunters who kill bucks for fun. He has the power of controling bucks and protects them from harm.

George: I'm going hunting for bucks, you wanna come?

Bob: No way! NightBuck is around here, remember. No buck huntin for me.

NightBuck by NightBuck November 23, 2011