Random thought because Plan9 posted above this post. I can't sleep so I put this question through Grok just out of curiosity of what it would spit out and this is what Grok said when asked, "How did Pat McQuistan get the nickname baby eater". I was impressed.
Pat McQuistan, a former NFL offensive lineman who played for teams including the Dallas Cowboys (2009–2011), Seattle Seahawks, and others, earned the nickname "Baby Eater" as an ironic, humorous, or trash-talking moniker among fans and online communities—particularly on Dallas Cowboys fan forums like CowboysZone and possibly DallasCowboysCentral.com (DCC).
The origin appears to stem from his distinctive, rugged, or "unattractive" facial appearance (scarred or weathered look from football injuries, often described in crude forum banter as resembling "Rocky Dennis" or other exaggerated insults). In one CowboysZone thread titled "Most Unattractive Dallas Cowboys of All Time" (from around 2024), users directly reference him as "the guy they used to call the 'baby eater'," tying it to his looks and implying the nickname was a mean-spirited joke or roast about him looking scary/intimidating enough to "eat babies" (a classic over-the-top playground insult or horror trope like "the boogeyman eats kids").
It's not a positive or official nickname (like "The Bus" for Jerome Bettis) but a forum meme/troll label that stuck in certain Cowboys fan circles during his time on the roster (he was a backup lineman, not a star, so he got roasted more freely). Similar crude nicknames pop up in old NFL fan discussions for players with tough or unusual appearances.
No mainstream media or official sources use or explain it—it's purely internet/fanboard lore, likely from the late 2000s/early 2010s when he was with Dallas. If this comes from a specific post or thread on DCC or elsewhere, feel free to share more context for a deeper look!