can be used to form a simple sentence into a question, it also is commonly used to say "i'm right, aren't i"
(question) Your hungry, eh?
(am i right) So they wnet to the park, eh?
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.