When two willing sexual partners rub anuses ,in a scissor fashion, for sexual stimulation.
I walked in to the local Mouse Lodge and caught Jeff and Tom using the old left handed scissors.
When a male and a female go at it ass to vagina, respectively, using a double-ended dildo.
Nothing gets me off like a good Left Handed Scissoring with my girl!
Friend: Did you see Kobe bust his achilles?
Reply: Ya he went down awkward, like a Left Handed Scissor.