it's an Indonesian slang which means when you're being way too sentimental or beyond sensitive about anything (take anything too serious) even on unnecessary thing
James: I'm so sad that Cleo didn't texted me today
Jaden: Dude, don't be Baper, you just met her for the first time this morning, she's not even yours!
Jaden: Dude, don't be Baper, you just met her for the first time this morning, she's not even yours!
by bish08 February 25, 2018
Get the Bapermug. by PP Reina April 6, 2015
Get the bapermug. by chandrakona July 17, 2006
Get the baper bantmug.