Vaca is the abbreviation of vacation in the english language.

Noun: a friend who is usually only called upon by a friend when a more primary/prominent friend is unavailable.

Taken from the term “second string” in an athletic competition situation. In football, if the star quarterback gets injured during a play, the second string is called off the bench to replace him/her. A “Second String Friend” is essentially benched until needed, if ever.

Synonyms: Plan B, Second Choice, Secondary Friend, Benched Until Needed

Short for vacation. Pronounced: vay-kay

The Spanish word for cow
Not to be confused with Baka the Japanese word for fool

Spanish word for "cow"

means cow, fat woman or bitch

Pronounced "vah-kah".
1) Refers to the town Vacaville, in Northern California, which contains not much of note besides two prisons.
2) common misspelling of the word vacay, a shortening of vacation.