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The DL or The Down Low, like many terms and phrases in the American culture, can attribute their genesis to the Gay and Urban Black community, The, "DL" has evolved to be used universally to refer to activities conducted secretly and behind the scenes. The DL can also refer to behavior described as slick or deceptive.
The term has truly evolved. In recent times DL has gone from being used exclusively to describe covert male homosexual behavior of a man fronting (portraying himself), as a heterosexual but in reality is actually a closet Gay man, to now refer to any behavior, action, or behavior that can be described as secretive or deceptive.

Etymology
DL or “Down Low”, attributes its genesis from the Inner City Black and Sub Culture. The Black community was slow to accept the male homosexual in their community so Black Men were maintaining a cover, by acting as they were only into the Ladies. Their homosexuality was secret and thus adopted the term, “Down Low” to refer to a man that is a closet homosexual or a man that engages in sexual relations with both male and female partners. The term evolved to identify such men as their female partners were discovering that their Man was subversively engaging in sexual relations with another man on the side, (on the DL) while their female partner was unaware of his behavior and sexual preference. Prior to the Homosexual descriptive, the term was used to describe: any kind of secretive, slick, and/or deceptive behavior.
None Sexual Reference: Steve is moonlighting as a Bartender on the DL so his friends don't go to the bar and harass him while on the job.
Sexual Reference: Mike is seeing His Girl's BF on the DL hoping she won't bust him out.
The DL by CarizmaGuy November 2, 2016
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Men, usually black or latino, who partake in heterosexual relationships, but also engage in homosexual activities with other men at "oppurtune" times. These homosexual encouters happen purely for sex not a relationship or emotional connection. Over 73% of black males, as reported on Oprah, are on The DL.
J.L. King on Oprah, was once on "The DL."
The DL by Shanalya Emiglaiman April 29, 2006

The DL Indicator

A predictable way to get better prices in stock market, options and futures investing in the direction he talks about in reference going out several weeks. Do your own due diligence.
"If you had listed and used the DL Indicator you would have made $10,000 instead of lost $15,000. There is always tomorrow."
The DL Indicator by Slanginfoguy August 12, 2024

The DL Indicator

A predictable way to get better prices in the direction he talks about in the next few weeks for stock markets, options etc. Do your own due diligence.
"If you had followed the DL Indicator you would be up $10,000 and not down $15,000. There is always tomorrow."
The DL Indicator by Slanginfoguy August 12, 2024
Meaning on the down low a turm used mostly by black homosexuals who are in the closet or the down low
a lot of brothas on on the DL
On the DL by NLR718 June 11, 2006

highkey must on the dl 

when it’s very visible that you want to suck dick/are sucking dick
your chemist father highkey must on the dl
To engage in an interaction, usually on a sexually basis, that involves no one but the two parties involved.
Will u meet me Aaron? Yeah, but only if we keep it on the dl.
On the dl by Aaron123c May 8, 2018
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I saw Satantango last night, wonderful film but by the 5th hour I had to start doing pee calculus.
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"The girl is pretty but she corrupt and dutty!"

or, in a positive usage:

"Booya! That freestyle was dutty!"
Dutty by J Hall April 3, 2003
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