In NYC slang, a mad check is an intensified vibe assessment — not just checking the situation but checking it hard, with full attention and genuine investment. When you do a mad check on someone you're really examining the full picture: their energy, their words, their consistency, all of it. Could also describe an unexpectedly large financial check or payment, since 'mad' in NYC English means 'very/a lot.' Either way, something is getting evaluated thoroughly or something is arriving in impressive quantity.
She did a mad check on his story before responding because nothing he said was adding up.
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