keep them collars down 

Intended to indicate that one might be suffering from Inflated Ego Syndrome (a little-known virus which predominantly affects white male freshman). Symptoms of IES include: wearing of Abercrombie, popped collars (hence the phrase "keep them collars down"), and also may include symptoms of Urban Imitation Disease (UID).

"Hey frosh, nice Abercrombie shirt! Keep them collars down!"

keep them collars down by kingofspain March 26, 2005

keep your mouth down 

A variation on the common saying, "keep your voice down", but with more emphasis on physically keeping the mouth out of sight and harm's way.

Secondary usage of the phrase:
Also used when receiving oral pleasure and the giver lifts his or her head at an inopportune moment, typically before climax or orgasm.

Bob: No, those girls totally reek of cigarette smoke, no way would I think about hittin' that.
John: Damn it Bob, keep your mouth down, they are right behind us.

or

Jimmy: Damn it, Jessie keep your mouth down, I was about to finish!

keep your mouth down by RocketJohn November 26, 2007

keep the rubber side down 

cycling slang for 'be safe'

on your next ride be sure to keep the rubber side down!

keep the rubber side down by wiggyfish October 23, 2008

THEY CAN'T KEEP A GOOD MAN DOWN 

They can try to knock the confidence out of a guy, beat him up PHYSICALLY AND MENTALLY, but he will keep on getting up, basically the quote "fall down 7 times, stand up 8"

No one can keep a good man down.
Good always prevails over evil , whether the people are jealous or envious of the person, they will never keep him down

For example, if one friend from a crew is seperated but has a good clean heart and he starts loving a girl, he might be seperated from his 'crew' but they're the ones who change NOT the person. They can knock him down and drain his confidence but no one can keep a good man down, he'll keep on getting up and be in their faces

THEY CAN'T KEEP A GOOD MAN DOWN by xee2009299 February 15, 2005

keep the greasy side down

An action; as in travel safe or keep your vehicle on its tires. Keep the underside of your vehicle to the ground...keep the greasy side down! The undercarriage of older vehicles especially, could be found unusually greasy and full of oil. In instances where there may be an oil leak on your vehicle or the exhaust was excreting oil.

You're heading out on your road trip to Yellowstone Park? Well then, keep the greasy side down!

keep the greasy side down by AB in MT February 18, 2010

keep it on the down low 

To keep something very secret; not tell another person

Alright, I'll tell you but keep it on the down low...

keep it on the down low by Treg November 1, 2003

keep it on the downlow 

In the closet; hiding the fact that you're gay

"Bob was afraid he would get caught kissing

George, so they had to keep it on the downlow."

keep it on the downlow by River Rocks September 8, 2018