Here, Steez takes a shot at the hipster backpack crowd who opposes elements frequently found in mainstream hip-hop (i.e. Autotune). It’s ironic because this counter-culture has become a culture of its own.
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That chick will suck (“blow”) Mac’s dick just as Tony Romo blows games.
Tony Romo, Dallas Cowboys QB is renown for crumbling under pressure. This line could be a reference to any of several choke jobs, but most likely to his botched hold in the 2007 NFC Wild Card Game vs. the Seattle Seahawks: