Did it blow out an airlock, or did you have a blowoff tube in it? Was anything in the airlock or blowoff container?

What does it smell like? I blow off more often than not, so I am always amazed when people act like it is a rare thing. Maybe everything is fermenting at much cooler temperatures than me(?) Anyway, a few more details may be needed here.

Hi Tim, this is actually my first blow off experience I usally have plenty of room in my carboy but this time I was close to the top. The wert blew thru the air lock and over the side smelled kinda hoppy at first but later when I went to clean up and sanitize it smelled funky corny . I took a wiff inside and it does smell ok, I think the aged foam gives off a bad aroma.