The Simlish alphabet has been translated before, but The Sims Freeplay, the game's mobile edition, appears to use a different one. Redditor Bump424 this morning published what figures to be the game's Rosetta Stone, and found some wirty-dords hidden in the signs.
A sign that appears to be a calendar instead says "Multiplication F**k You" in Simlish. A diploma says "Certifica Name Blah Suck S**t D**k C**t Sensa. "S**t" was written sideways on a hairstylist's sign. Probably my favourite is the dojo flag above, which features a fist, the yin-yang symbol, and "F**k Mike Bensa" written backward. Poor Mike Bensa!
There are tons of other non-potty mouth words Bump424 translated ("Lap Time" and "Blanko" appear above a train station clock, proof that even when using a fake alphabet no one can read, you can't use real brand names without permission.) For more, hit the Imgur gallery at the link.