pigfin Share definition Flag pigs can have 30 minute orgasms, dolpins are the only animals known to have sex for fun. A pigfin is someone who has sex for fun and has many/long orgasms. "Man, the girl at that party was a real pigfin." pigfin by Jo-00 September 12, 2005 0 0 Get merch Get the pigfin mug. Buy Now — $32.95 See more merch