1) Substances duplicitously sold as illegal/illicit/recreational chemicals that do not produce the desired effect.

2) Illegal/illicit/recreational chemicals cut to such an extreme that their effect is severely reduced.
If you buy from a stranger at a rave, be prepared to get bunk pills, or worse.
by mig March 08, 2003
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In Rhode Island, to "bunk" is to take the day off from school. Most days before extended breaks are referenced as "national bunk days", despite "bunk" being local vernacular.
Vinny: We have next week off, you know what that means!
Tony: Friday's national bunk day!
by Bubbla April 13, 2006
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Something that is ineffective, shitty, worthless, low quality, defective.
This Jeep is sick but it gets 12 miles per gallon. The gas millage is bunk.

I bought some weed from dealer and he said it was gas but it was bunk. He just lost my business.
by LordQuisiModo October 04, 2020
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Unknowingly repeating information that is a hoax, prank, or general misinformation that has surfaced on the internet or by word of mouth. Generally the person is repeating information that is highly illogical or just unbelievable and thinks they have stumbled upon something brand new that they have to share with everyone ASAP!
Brian: Bro, I saw where they are coming out with hover boards pretty soon!
Alex: No shit, I dont believe it!
Brian: Yea bro, here is the youtube video: (video: A4vE_vpkr90)
Alex: Oh OK it must be real then.

Alex: Bro they finally came up with hover boards!!! Brian showed me the video.

Me: Bullshit, that whole thing was a hoax (provide them with link). Brian just bunked the fuck out of you and Im getting really tired of DE-bunking him.
by coderman April 07, 2014
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1 not good; crappy

2 Commonly used as a substitute in the name of something that you don't like.
1 That new Jonny Deep flick ("Charlie and the Pussy Factory") is bunk, but that cat sure does have the AP.

2 Starbunks, Raisen Bunk, the bunkyard, George Clinton and the Bunkadelics,
by the_guy January 21, 2005
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Dissatisfying; Not up to par.
While renting a movie: 'The selection here is bunk'

or

While at a party: 'This crowd is so bunk'
by MoxyAnna June 01, 2005
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