JF

Just Friend

JF is told to a person that you just accept him as a close friend ( a friend who does not lead to marriage).
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EX

Exes

In social relationships, the former Person (ex) is the person who once had been in a relationship or marriage with him.
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EST

Eastern Standard Time

Time zone eastern (ET) is a time zone contains 17 states in the eastern part of the mainland of the United States,
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PM

Private Message

PM is usually in the chat application is to the meaning of the Private (other means: confidential).
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