Penis Illin' = a male STD that can be cured with penicillin.
DR. ROGER MOORE, UROLOGIST: Gee, Billy Bob, it seems you have some Penis Illin' goin' on here.
BILLY BOB: Oh my dog, Dr., am I gonsta die?
DR.: No Billy Bob.
BILLY BOB: Am I gonsta get my Peter whacked off?
DR.: Not by me Billy Bob. This aint no Peter Graves, it's just a Peter Boyle. A little penicillin and you'll be AOK.
BILLY BOB: Thanks Doc!
DR.: Billy Bob, you have seven wives. You haven't been seeing a prostitute have you?
BILLY BOB: No, I was just fucking Kelly in the butt without a rubber. And I fell asleep right away and didn't wash up until the next morning. It hurt when I peed, and my piss shot a poop plug out of my weiner. Now it's all red and pussie, as you can see!
DR.: You lucked out this time boy. You better use a condom next time! Did you fuck any of your wives AFTER the buttfucking incident?
BILLY BOB: Yep. All seven.
DR.: Oh my God, Billy! You better send them all in ASAP!