1)very insane/intertaining occurence.
2) Sloppy, spit filled kiss.
What a slobber knocker this boxing match is!
Dude thats sick! He just planted a big slobber knocker on him!
Perpetual, swift and powerful thrusting into the vagina by the male from the mounted position of doggy style, hence the name "slobber knocker"
That hooker aint ever gonna recover from that! After all it was the slobber knocker