Spanish swear words beginning with the letter U

Phrase Meaning Is This Accurate?
un pedo a fart (0%)      (0%)
un pedo viejo an old fart (100%)      (0%)
Usted es un joto You're gay (55%)      (45%)

Spanish Swear Words by Letter:
A B C D E F G H I J K L M N O P Q R S T U V W X Y Z