"Mar-Kay-Oh". Slang code for "doing twins", derives from Mary Kate and Ashley Olsen.
BASIL: Austin, did I here you tell the Fook twins that you and Dr. Evil are going to double date them tonight? Are you FRIENDS with Dr. Evil?
AUSTIN: Of course not, Basil. I just told THEM that Dr. Evil is coming along. Dr. Evil knows nothing about it! When I show up, I'll just say that the Dr. called in sick and voila, Austin will be in a MarKaAo 3some. Twins, Basil,TWINS! You messed it up for me last time, remember?