A retarded guido. Commonly used to refer to cast members of the MTV show Jersey Shore.

Masculine: guitardo(s). Feminine: guitardette(s).
Human Being: Hey, what are you doing today?

Guido: G.T.L. baby. Gym, tanning, laundry. You gotta do the guido handbook.

Human Being: Wow! You f*#%ing guitardo! No! Bad guitardo!
by Ricardo Pellitardo August 6, 2011
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