[jim-dandy] {n.}, {slang} Something wonderful; something very good. * /Tommy's new […]

[jissom] {n.} semen (taboo).

[Joe Bloggs] {n.} A man who is average, typical or unremarkable.

[Joe Doakes] {n.} A name used informally for the average man. […]

[Joe Soap] {n.} An idiot, stooge or scapegoat.

[John Doe] {n.} A name used for an unknown person, especially […]

[John Hancock] or [John Henry] {n.}, {informal} Your signature; your name […]

[John Q. Public] {n.} A name used informally for the average […]

[John Thomas] {n.} Penis.

[Johnny] {n.} Condom. Sometimes also a 'Johnny bag' or 'rubber Johnny'.