Similar to a Mimosa, it is a mixture of Keystone Light beer and Orange Juice.
Typically in the morning, one would crack open a nice cold can of Keystone Light, take a few gulps, then fill the can back up with freshly squeezed orange juice.
BAM! Instant Hobomosa!
Typically drank by the homeless and those who cannot afford champagne.
Commonly served with a side of 3 Tums.
"Hey man, Nascar is starting at 8am this Sunday. Why don't you come over and have some Hobomosas with me before the race?"
Those guys spent all their money at the bars last night, now they have to drink Hobomosas!