セフレTop 20000MeaningsNoun1. friend with benefits; hookup buddy; fuck buddy (Abbreviation, Colloquial)Examples2セフレが足たりないっていうの？You mean you're short on fuck-buddies?僕ぼくは奥おくさんよりセフレがほしいのです。It's not a wife that I want, but a sex friend.