What does PMFJIB mean?
Pardon me for jumping in but
Other definitions of PMFJIB:
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More slang terms:

ILYG
I Love You Guys

SMOFF
Serious Mode OFF

TOTD
Tip of the Day

Bredrin
A Rastafarian slang term of the word "Brethren", which is the archaic plural of brother. Often used as a term of endearment among friends.