never; it won't happen
F student: Think I could get into Harvard?
A student: When pigs fly!
by William MacCabe November 24, 2005
Get the when pigs fly mug.
Sacrastic sentence suffix to indicate non-adherance to the subject in hand.
Sure I'll pay you... when pigs fly!
by Gumba Gumba February 25, 2004
Get the when pigs fly mug.
A not so subtle reference to Attorney General William Barr flying all over the world to investigate “Deep State” politics and international connections to it.
Of course it is entirely improbable that Attorney Generals travel all over the world to look into screwball conspiracy theories, but AG Barr has made the improbable come true, so we can now say “when pigs fly” and really mean it!
by Dr Bunnygirl October 8, 2019
Get the when pigs fly mug.
A statement made when somebody mentions the improbable.
Lame Person Who neithers Bathes nor Thinks- Duuuhhh...so when can I get your phone number?

Me- Oh, let's see...how about when pigs fly?
by RatchetBoo June 6, 2003
Get the when pigs fly... mug.
A random gurl:can you join our litterature club

that mc who believes in gender equality like me: when pigs fly
by NeonPhantomFox October 2, 2020
Get the When Pigs Fly mug.
The 2009 H1N1 Virus which is believed to be made up of Human, Swine, and Bird parts.
The chance of getting this new virus from pigs, birds and people in the spring is about one chance in a million. I think that's why we call it the when pigs fly virus.
by Tomicus May 11, 2009
Get the When Pigs Fly Virus mug.
The first Wednesday of October, farmers around the world climb to the tops of their barns, strap wings on a pig, and throw it down onto a mattress.
Howdy, y’all! Get your porkers ready, because it’s International When Pigs Fly Day!
by TheMoosetopian November 2, 2021
Get the International When Pigs Fly Day mug.