undercover lover 

Being someone's secret lover.

I saw Jack sneak into Sally's house last night, he's her undercover lover.

undercover lover by Omi8o8 January 15, 2008

Undercover Lover 

Non-alcoholic drink disguised as a cocktail; commonly drank by pregnant women not yet ready to make the news public. Ex: soda water with a lime in a tall glass that appears to be a vodka tonic.

I discreetly ordered an undercover lover from the bartender so my girlfriends wouldn't know I'm not drinking.

Undercover Lover by Lonestarqueen16 January 23, 2017

Undercover Nigger Lover 

A white person who has sex with black people, but finds it shameful to tell their white friends for fear of rejection or ridicule.

Tim's dad kicked him out of the house & disowned him when he found out Tim was banging black girls. He tried to hide it by being an undercover nigger lover, but all UNL's eventually get caught.

Undercover Nigger Lover by Ehud Avni November 14, 2010

Under Cover Penis Lover 

(n.) A closet homosexual male. Acts homophobic around his friends to try and disguise his true love for the penis.

Started by nugluh on YouTube.

That Chuck Norris character is a little tooo masculine... could he possibly be an Under Cover Penis Lover?

Under Cover Penis Lover by teenybeeny December 9, 2008

Under Cover Cyber Lover

A person whose only presence in your life is through the World Wide Web but you maintain a romantic relationship with them through e-mails or instant messages on the down low.

Neil is your under cover cyber lover, you're so lucky!

Under Cover Cyber Lover by Beavv10 August 25, 2008