yes. they're more like slang terms, just extending the length of the word to show excitement. honestly though, "yessss" is the only one you should use. not "yeeees" listen to pronunciation example for why.|"Yeees?" is usually used with the intonation of a question, in the context of "Yes, what is it?". Whereas "Yesss" is used to say "yes" very emphatically. I say 'yesss' fairly often, but the ... More @Wikipedia
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