I’ve always said “emm-pee-SIMS.” And I’ve never honestly considered how I might pronouce ROTFLMAO. “Rot-full-mao” was the first thing that jumped to my mind.
MPSIMS: “M-P-simz”, or “Impy Sims”
Tuba Diva: “Too-ba Die-va”
Esprix: “Ess-prix” until I found out better
IMHO: “Im-ho”
ROTFLMAO: “Rolling on the floor, laughing my ass off”
matt_mcl: “matt-m’kl”
Magnetout: “Mag-net-owt” but I just found out yesterday it’s [French]mange-tout[/French]
Sue Duhnym: “soo DUH-nimm”–with the misplaced accent, I don’t hear the pun.