Papyrus: Nyhe heh heh! I got a swim suit! And it even says cool dude!
Sans: I guess now it says pool dude ;)
Papyrus: SSSSAAAAANNNNSSSS!
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Explanation
Explain Bear
Okay, so basically, Papyrus got a swimsuit that says "cool dude." Sans, being the funny guy he is, makes a pun and says it now says "pool dude" because it's a swimsuit. It's funny because they are brothers. Also, you probably watch anime. I can tell.