Slagseeker Share definition Flag Slagseeker- a type of imaginary missle aimed at slags, the annoying girls who shout all the time and are just plain dumb. Quick, get the slagseeker and pwn those slags over there. Maybe then they will STFU! Slagseeker by Gumbertron July 23, 2007 0 0 Get merch Get the Slagseeker mug. Buy Now — $32.95 See more merch