What do guys mean when they say "lets hangout"?

so I started noticing that guys have never asked me out like straight forward, One time a guy asked me to hang out and I was like yea ill let so and so know and ran off to tell them, turns out he was asking me out on a date. I get confused by this because a lot of guys ask me to "hangout" not sure if they're interested in me or if they just want to chill to make time go by.
What do guys mean when they say "lets hangout"?
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