When a person (usually without income) trades an item of theirs for a different item that belongs to another person (regardless of whether they are there, or not, to agree with the trade.) It is not outright theft; rather an exchange of items, even if not verbally agreed to.
"I Hobo-Traded my backpack for his blanket while he was gone all week."
A woman who is so hard up for sex that she lets a homeless person sleepover with her just so she can get laid.
"Barbara is such a hobosexual, you know she only lets him stay with her so she can get laid. Poor fellow."
The taking of an item (usually of low cost) in order to survive.
"I hoboed off with a jar of peanut butter for dinner this week."