From, the incel encyclopedia

Branchswinging is female hypergamy put into action. The term refers to the notion that a hypergamous woman will always make sure she has hold of the next "branch" (i.e. male relationship prospect) before she exits her current relationship and enters a new one (monkey-branches) with the more desirable man. The term is used to imply that women are inherently disloyal, and will exit their relationships when they have a good prospect of initiating a new one with a man with a higher SMV than their current partner, or a man she otherwise perceives as more desirable.

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