Pon Farr or I know it when I see it.

Spock: Would you beam down to the planet's surface and stand with me? There is a brief ceremony.
James T. Kirk: Is it permitted?
Spock: It is my right. By tradition, the male is accompanied by his closest friends.
James T. Kirk: Thank you, Mr. Spock.
Spock: I also request Dr. McCoy accompany me.
Leonard McCoy: I shall be honored, sir.
James T. Kirk: What is this ceremony Mr. Spock.
Spock: It’s is called Pon Farr
Leonard McCoy: Wait a minute, doesn’t that mean two hogs in Vulcan?
Spock: No that would be Pon Tituspenisneckpinched.
James T. Kirk: As you were Boner.
Leonard McCoy: THAT'S BONES GODDAMMIT!
(Star Trek, Amok Time Season Two Episode Seven)