The person that said it was very animated and happy, but it sounded exactly like the word psycho. Thank you.

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    I have seen サイコパス(Saikopasu) for psychopath but never サイコ(saiko) alone. Definitely istrasci answer! – Felipe Oliveira Mar 29 '17 at 17:04
  • If I'm not very much mistaken, Saiko is a fairly common name in anime, if not in real life. Are you sure the one who spoke wasn't calling someone's name? – Steve-O Mar 29 '17 at 20:51
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    @Steve-O I don't think are that many 'Saiko's, even in anime. – Aeon Akechi Mar 29 '17 at 23:18

[最高]{さい・こう} means "the highest/maximum/best/greatest".

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最{さい}高{こう}, or sometimes stylized サイコー, particularly as an interjection, is an expression of how fun / cool / enjoyable something is -- as was the case in your question.

However, as istrasci pointed out, in itself 最{さい}高{こう} means the superlative of some state.
Some examples: 最{さい}高{こう}級{きゅう} -- Highest grade / class / rank.
最{さい}高{こう}経{けい}営{えい}責{せき}任{にん}者{しゃ} -- Chief Executive Officer (literally the "highest person responsible for business administration").

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最高(さいこう) is used exactly like "awesome" is used in American English. It is mostly used in spoken language, rarely in written language.

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