The act of slapping a person's breast starting with moving the breast up then slapping it back down. Also the perpetrator may loudly exclaim "SCUBA SLAM" during the process.
Jill was extremely pissed at Ralph for giving her a scuba slam.
The act of placing ones head up a others bum hole and breathing on their farts. this is different than snorkoling which is the act of puting ur head up the bum and pulling out to breath.
Dom: this chick was crazy last night
Ben: what did she do
Dom: she wanted me to go scuba diving in her
Ben:shit thats fucking nasty