Definitions by Lyle Plapp Phd.

segging 

Sex act. Both participants start in a standing position facing each other. They both raise their arms above their heads in a full stretch. One penetrates the other and they both lean backward forming a Y shape - a self balancing "segway" like structure.

John snapped his penis off last night in a freak segging accident.

segging by Lyle Plapp Phd. March 21, 2019