PBFL 

PBFL by definition simply means, "Penis beards for life."

Yeah man PBFL!

PBFL by Turkeyham July 4, 2011

PBFL 

Poop buddy for life. The person you tell every time you poop and who knows your poop history better than anyone else. A lifelong commitment to sharing your poop information.

"I just dropped a massive turd! Better text my PBFL to let him know."

PBFL by EvilParalyse February 24, 2010