Top definition
A fake friend.

One who pretends to be your "bro" but really does not care.
I thought Bob was cool but he turned out to be a total Placebro.
by AMJacker January 27, 2010
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Jul 15 Word of the Day
The safeguarding of Earth and other worlds from biological cross-contamination (i.e. billionaires with too much time on their hands).

Also known as “planetary protection.” Planetary protection / quarantine “reflects both the unknown nature of the space environment and the desire of the scientific community to preserve the pristine nature of celestial bodies until they can be studied in detail.”

There are two types of interplanetary contamination. Forward contamination is the transfer of viable organisms from Earth to another celestial body. Back contamination is the transfer of extraterrestrial organisms, if such exist, back to the Earth's biosphere.
Billionaires are having a dick swinging space race while the earth experiences record breaking heatwaves that cause sea creatures to literally cook inside their shells. We need planetary quarantine.
by monkeylabor July 14, 2021
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2
A white guy that tries to act like like he is black by wearing the baggy clothes and speking ebonics.
Rodney is a placebro. He's having a racial identity crisis.
by Jimmy The Schwantz November 14, 2008
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3
A Bro that is your backup Bro when you're Bestest Bro is unavailable
Jack: "Hey Chet! Do you want to Bro out tonight?"
Chet: "Ah sorry man, I've got plans."
Jack: "Ah, that's alright. I'll call up Alex. He's my placebro."
by Bclique22 May 24, 2015
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