B4R
B4R means 'But For Real' and is used when you're trying to sound sincere but still acting like a complete idiot.
B4R I swear I didn't cheat on the test, I just forgot my eyes were closed.
B4R I really did try to fix my bike, I just threw it at the wall 20 times.
B4R I didn't steal your lunch, I just borrowed it for a minute... maybe 10 minutes.