BFR
BFR definition by Slang.net - The Slang Dictionary
This page explains what the acronym "BFR" means. The definition, example, and related terms listed above have been manually compiled and written by the Slang.net team.
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Mountaineers, excavators, and friends of the recently-engaged may use BFR to mean "big freakin' rock." When mountaineers and excavators use BFR, they are likely referring to an actual large rock. When friends of the recently-engaged use BFR, they are likely referring to a diamond included in an engagement ring.
Excavators dig up BFRs, while mountaineers use them as landmarks or anchor points. The recently-engaged tend to wear their BFRs on their ring fingers.