- "I ain't sayin' nothin'!"
- ―Johnny's catchphrase
Johnny Tightlips (Born Giovanni Silencio. Legal name: Jonathan Schmallippe) is a caporegime for the Springfield Mafia, working for Fat Tony.
Johnny's typical catchphrase is "I ain't sayin' nothin'!" though he does speak occasionally (albeit vaguely, as seen in 22 For 30. Johnny is depicted as being in his late 30's/early 40's, though his exact age is unknown. He is frequently seen with Fat Tony, Legs and Louie. Johnny has short wavy black hair, thick eyebrows, and wears a pinstripe shirt tucked in a purple suit.
Like his nickname, Johnny says very little, which spares him from accusations of being a "squealer", but his reticence tends to be unhelpful to himself and others. An example of this is when there was a shoot-out in Fat Tony's mansion, and Johnny was shot by accident. When asked where he was injured, he replied, " I ain't sayin' nothin'!", and when asked what to tell the doctor, he said, "Tell 'em to suck a lemon." 
Fat Tony has referred to him as his "Joisey (Jersey) muscle." 
Frankie the Squealer once said Johnny has a bad back. 
Despite his occupation as a mobster, he also seems to have an altruistic side, as Homer has once revealed that Johnny digs wells in Darfur on his vacations.
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The Simpsons: Tapped Out
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Behind the Laughter
Johnny Tightlips is a reference to Frank "Tight Lips" Gusenberg, who was shot down in the real-life St. Valentine's Day Massacre in Chicago and replied "nobody shot me" while dying.
On the "Insane Clown Poppy" commentary, it is discussed that the original name for the character would be "Tightlips Johnny"
- The character's last name is a reference to the Omertà (Mafia code of silence).
- Johnny drives a black Lincoln Continental, with license plate "ZERO2SAY." 
|Factfiles from Simpsons World the Ultimate Episode Guide: Seasons 1-20
| Season 14
| Rock Stars • Audrey McConnell, Third Grade Teacher • Dr. Velimirovic, Plastic Surgeon • Mitch Hartwell, the Reality Channel Producer • Junior (AKA Frank Grimes, Jr.) • Teacher of the Year Award Nominating Committee • Dexter Colt, Private Eye • The Mugger • Larry H. Lawyer, Jr. • Baby Stink-Breath • Booberella • Sara Sloane, Hollywood Movie Star • Cookie Kwan, Red Coat Realtor • Stark Richdale • Declan Desmond • Julio and Grady • Luke Stetson, Junior Wrangler • Suds McDuff, Spokesdog/Mascot for Duff Beer • Marriage Counselor • Jim Proudfoot • Don Castellaneta