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!
Bawa perasaan.
Suatu keadaan dimana hal kecil menusuk sampai hati.
"Gitu doang. Baper banget lu"
"Jangan baper-baper"
Dick or cock of a father is called baper bant.
In bengali:-Baper bant khao dhur kothakar.
In English:-Eat your father's cock idiot.