when something has run it's course but one or more participants refuse to acknowledge it.
i broke up with her last night but she showed up at my place today for lunch, all "jay leno" like we were still together...?
by wgzn September 30, 2009
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a comedian with a popular talk show who has a large jaw and collects cars
Guy ---- "I am sorry, but we have to break up."

Girl -----"Oh, But why?"

Guy ---- "Its your chin... you look like... like... JAY LENO!!!!!!!!!!!

Did you hear what Jay Leno said on the tonight show last night?
by master stghm April 4, 2004
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1. Slang for a pathetic hack.
2. Slang shameless hack.
3. One who appears to trumpet his or her lack of originality.

Terms are derived from the characteristics of popular television program The Tonight Show's host, Jay Leno. It refers to him bribing away talent from their original sources instead of cultivating his own (see John Menendez, formerly of The Howard Stern Show, and That Glasses Guy, formerly from The Daily Show With John Stewart) as well as blatantly stealing comedy bits from other comedy shows (see Celebrity Jeopardy skits, originally performed on the program Saturday Night Live).
"Billy overheard the premise for my Science Fair project and he totally Jay Leno-ed me."
by Proud American March 8, 2005
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A strap-on attached to the chin, used especially for penetration and party tricks. Similar to a screwnicorn, in which the strap-on is attached to the forehead. It is thus named because the wearer winds up with the ginormous chin, only slightly smaller than that of Jay Leno.
I tried sending a picture of my jay leno in to Late Night as a look-alike for Jay's chin, but they did not show it on air on NBC. That pissed me off.
by Kerry Gibbons October 29, 2005
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the 'Brett Favre' to Conan O'Brien's 'Aaron Rodgers'; coming back in the wake of retirement to screw another man's career; flip flop
Man, don't be a Jay Leno. Step down while you can, and let someone else handle it.
by SawGuru January 14, 2010
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an insult you call someone if they're a backstabbing whore who crushes dreams
That Jay Leno stole Conan O'Brien's time slot and the integrity of late night talk shows.
by imisspenhall21 January 15, 2010
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is a cheap hack compared to comic legend and part time real estate agent Conan O'brien
screw leno, let's watch soemthing else 'till conan is on
by steve February 26, 2005
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