(adjective) The term used for when you're dapping up your bois and grillz. It is the present participle form of "Choo", which is what you say when you dap up your homies/brothers.
Brother 1: "Yo my boi what's good witchu!"
Brother 2: "Ayo what's good witchu brother!"
Brother 1 and Brother 2: *daps each other* "Chooooooooooooooooo!"

Brother 3: "You two really do love Chooing don't you!"
by Lead Bud 123 May 3, 2021
Aussie slang for boost pressure from a turbocharger. Made famous by the Youtube show Mighty Car Mods guys Marty and Moog.
Marty's MX5 has some mad choo-choo

Moog's Forester got a new turbo, giving it a bit more choo-choo
by Dannydabaker December 20, 2013
(verb) to run a train as by multiple males having intercourse with one female

(noun) the act of running a train on a female
Let's choo choo that bitch! Chuch!

Troy's never once been in a choo choo.
by Lenny Presley June 10, 2007
Dude, there are so many Choo-Choos at this Vampire Weekend show!
by Richard Busy October 22, 2009
Animated cat from 60's cartoon, 'Top Cat'. Choo Choo is Top Cat's right hand man. Definitely the cutest cat of the gang. Never seen without his tight white shirt.
Top Cat: "Hey Choo Choo, do you ever take off that tight white shirt of yours?"

Choo Choo: "Nope. Eating breakfast = tight white shirt. Playing tennis = tight white shirt. Sleeping = tight white shirt. Having sex = tight white shirt."
by Isn'tThisColeslaw August 9, 2009
"I'll just be getting the choo choo to Marylebone."
by Billy-Bob McSanchez April 6, 2005
when at least 5 gay men get in a line 1 bends over and they stick their dicks in each other`s asses and crawl around the room yelling CHOO CHOO
man your dad likes to CHOO CHOO in your room
by funnyman 25 January 5, 2011