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A lying sack of poop that promises to be back in a sec but really means they're gonna vanish for the rest of the day or forever.
'I'll be a sec,' he said, then didn't come back for the whole movie.
'I'll be a sec,' she said, then went to get pizza and forgot about me.
'I'll be a sec,' he said, then got distracted by a TikTok and never came back.