What is like a hobo on a ham sandwich?

to be thoroughly motivated to do something, or to do something as eagerly as a hobo would be to see a free ham sandwich

Lucas jumped in that pussy like a hobo on a ham sandwich.

like a hobo on a ham sandwich - video

to compare someones rush to get something to the zeal in which a hungry hobo would snag a ham sandwich he/she just found

As soon as he saw his ho, he was all over her like a hobo on a ham sandwich.

Cuz he hasn't gottin any from her in like a week.