If you don't understand sarcasm, Scott Disick is fucking Kourtney, Khloe, and Kendall. There's been a shit ton of rumors lately about Scott cheating on Kourt with the other Kardashian sisters, so they decided to troll everybody on Twitter. The Kendall and Scott rumors are hilarious because they had a solo lunch together and he helped her buy a dress, both of which question his sexuality more than suggest they're hooking up. Khloe and Scott have the weirdest fucking relationship ever (see that time she punched him or that time they talked about sex in a bathtub), but Khloe only likes black guys, so anybody who has seen 5 seconds of KUWTK would know that relationship is a bust. Here's the full exchange:
Khloe: I'm really pissed about this whole @KendallJenner and @ScottDisick thing!! Scott, I thought it was you and I that was having the affair.
Scott: Don't worry @KhloeKardashian you will always be my number 1.
Kendall: Excuse me?
Khloe: He wants an LA face with an Oakland booty!
Kourtney: Sisters after my man again?! Party!!