Spanish slang, with a literal meaning of "large butt." Nalgón is masculine, nalgona is feminine. It refers to someone who is slow moving. It is often used by drivers when stuck behind such a person.

When some little bitchboy is acting like a little tiny pee pee poo poo baby and messing up the group plans.

spanish slang for "wide ass"(m), derived from the noun "nalga", meaning "buttocks". Often used in reference to a slow-moving or thinking individual. Can be used in the feminine form: nalgona