[yen223]

I have a theory that if a word is less than 5 letters long, it probably means male genitalia in a foreign language.

[semi-extrinsic]

Interestingly enough, the number of <5 letter words in English is of the order of 10-15 000 [1], while the number of languages is 7000. Since most languages (I guess) have more than one word for male genitals, it is technically possible for all English <5 letter words to mean precisely that.

[1] http://norvig.com/mayzner.html