light, generic, cheap beer that middle-aged men (dads) buy. refered to as "dad beer" when consumed by 20-something kids who still live with their parents, who are either too poor to buy the good stuff, or (in most cases) they just ran out of it and want to keep the party going.
"hey, we're all out of jagermeister, but I've got some dad beer in the fridge if you want some."
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