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(noun) Common term used for a UV (UltraViolet) light/light bulb. Used in CSI often to find a semen samples.
possible semen sample plus a blacklight situation:

Officer Michaels: "I often go to sleep and dream of waking up in a world where everything's covered in semen."
Officer Slater: "I mean, who doesn't ?"
Officer Michaels: "It'd be nice. Like that crime scene today."
Officer Slater: "Yeah."
Officer Michaels: "If the man had ejaculated and then punched you in the face..."
Officer Slater: "Yeah."
Officer Michaels: "...we'd have a real good shot at catching him."
Officer Slater: "No way."
Officer Michaels: "Just punched in the face, no semen."
Officer Slater: "Yeah, no semen."
Officer Michaels: "Story of my life."
by THC420 December 02, 2009
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Apr 22 Word of the Day
When you eat dirt for the first time and leave your family to build a shack in the woods
Bro since I got dirtpilled on Tuesday I have made sooo many worm friends and made them soo many little houses to get married in. Me? Lonely? No you’re the lonely one u lawn owning freak
by ecogoth December 30, 2020
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2
A light that causes so many sexual urges, a man will grab the nearest chick and bone the living shit out of her.
*Hot guy* "Hey, sorry we w'ere late, we w'ere fucking hardcore under the blacklight."

*Random chick* "Dude, it just caused urges i could not ignore."

Another example: *Lil' kid* "Mom how are babies ma...*"

*Mom interrupts* "BLACKLIGHT!!!! BITCH!!!"
by nanafunana April 21, 2011
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3
To hit a dab pen or other vaping device until the device stops and the light turns off (hence the name)
"Alex blacklighted my pen now he can't walk"
by Cantaloup3 December 22, 2020
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4
To simply put it is a white person biologically "white" trying to change into black person usually it's people who found out there a "%" of a race
Example: Jayvin found out on ancestry.com he is 20% black so he is acting "black" aka a black light
by Za definer April 27, 2020
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