What does «pa» mean in Spanish?

Apocope of dad.

Examples of use in Spanish: "pa, me voy a estudiar a la casa de mi amiga, ¿me dejas?".
Apocope of the preposition "para", used by country people, uneducated, in a funny way or in song lyrics.

Examples of use in Spanish: "¿pa qué me hiciste venir?".
Interjection of surprise.

♦ Used in: Uruguay

Examples of use in Spanish: "¡pa! qué carrera te perdiste".
Friend.
(PA) Andalucista Party.
(Pa) Chemical symbol for protactinium.
(Pa) Pascal symbol, unit of pressure.
(p.a.) abbrev. By authorization.
(p.a.) abbrev. For absence.
(de pe a pa) Entirely, from beginning to end, in detail.

Examples of use in Spanish: "deberás aprenderte esto de pe a pa".