From RuneScape Classic Wiki
F
Abbreviation
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Meaning
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F2P, F2Pers, Ftp, Freers
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Non-members (Free-to-play)
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Fally
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Falador
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FI/Fall/Fi
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Fall in, used to get people to follow a leader into a war or battle or player killing trip.
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Flat
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A term used to describe having 99 Attack, Strength, Defence and Hitpoints.
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Flip(ing)
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A term that refers to buying an item and then, within a short period of time, selling it for a profit.
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FM
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Firemaking, Forum Moderator.
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Fraw(s)
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Free raws, when at a fishing spot (i.e. trout and salmon).
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Froob
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Free-to-play noob
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