The one-handed shit you got to say, to you, touche
Fencing is the sport of fighting with swords, where you only use one hand, the one wielding the sword. He’s comparing his rapping skills to fencing skills.
Touche is also a term used in fencing meaning touch/hit. Tying this line and the following line together: “…hit it on Tuesday.”
Also, you wipe your ass (“shit”) with one hand.
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