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When you nod like you get what someone is saying, but you really don't. Like when your buddy says 'you think we're on the same page?' and you say 'duh' but you're totally confused.
'Bro, we're on the same page, right?' 'Yeah, bro, I'm totally not confused.'
'You think we're on the same page?' 'Yeah, I'm not high.'
'Are we on the same page?' 'I think I'm just mad.'