The abbreviation of the phrase 'Put out first night'. The act of sleeping with someone after only the first night of meeting them.
Generally pronounced as a word, for example 'Poffon'
Variations on this are pofning and pofned
Dave: Hey Neil, I bet she pofn!
Neil: Yeah she does, I slept with her last night and only met her yesterday!
or
Neil: What happened to that girl you met last night?
Dave: She Pofned
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