When you have no intention of paying for something/don't believe something. People used to pay for things by check and it would take some time to arrive. If you didn't have money, you could buy something without paying, saying "the check's in the mail."
"Hey, when are you going to pay me for that weed?" "The check's in the mail, bro."
"The supreme court is going to uphold the voting rights act? Yeah right. The check's in the mail."
by quietbanana October 6, 2022
Get the Check's in the mail mug.
A mocking neg used in sports/ games against an opponent that just made an unforced error that greatly helped you or your team.

The phrase suggests that the error was actually intentional and they were attempting to "take a dive" to receive payment.
In Sports (Baseball):
*Thrown ball tips off of first basemen's glove and flies off into foul territory*

Runner as they round first heading for second: "Check's in the mail!"

Video Game (Any MOBA)
*Opponent uses an ability to grab and pull you away from a deadly situation, allowing you to use a movement ability to escape there after*

All Chat: "Check's in the mail!"
by The_Post_Man March 19, 2021
Get the Check's in the mail mug.
slang term for masturbating. People say they are checking their email when they are really looking at internet porn.
be right back, im gonna be checking e-mail.
by wkrpinpitts February 11, 2010
Get the checking e-mail mug.
When you have no intention of paying for something/don't believe something. People used to pay for things by check and it would take some time to arrive. If you didn't have money, you could buy something without paying, saying "the check's in the mail."
"Hey, when are you going to pay me for that weed?" "The check's in the mail, bro."
"The supreme court is going to uphold the voting rights act? Yeah right. The check's in the mail."
by quietbanana October 6, 2022
Get the Check's in the mail mug.