It is when you punch someone so hard they go through the earth, most typically used by Dwayne ‘the rock’ Johnson in his bid to become the only Hollywoodactor working today
"We did but the several guys from the bass tour just slaunched in them. Matter of fact, your friend Clay just slaunched the last one. The showers are all closed for cleaning."
A slapping motion with a closed or semi-closed fist. Often used by girls or really weak, pathetic guys trying to fight each other without using full force.
"My girlfriend slapunched me in the back because I told her to lose weight"
"Man, that hipster guy got slapunched right in the face, that will leave a mark"