sour pants can be ysed on two ways, one rude and one nice, in slang sour means cool, nice, awesome, or sweet and pants means, well pants can be used as anything, or sour can also mean gross, ugly, strange, or stupid so it also could be used to insult or belittle
(good)That roller coaster was so sour pants.
(bad)Your dad can be so sour pants sometimes.
Used to refer to coworkers' apparel choices. Most commonly refers to coworkers who wear the same outfit multiple times in a week.
History of the word derives from a particular individual who wore brown pants to the office more than once. Even up to three times per week.