A fork of Rural Dictionary
If your getting head and you blow an airhorn just before you bust a nut, she will jerk up and you will continue to orgasm and blow it in her face, this is called a Swedish Foghorn.
Your girlfriend complained because you failed to warn her last time, this time give her the Swedish Foghorn. Is there any better warning? NO!!! You meet a girl at a party and decide to get freaky, you take her to a vacant room, when all your buds hear the telltale sign of the Swedish Foghorn, "a loud horn", they will cheer your name, mad props.