The phrase "one's own guy" means someone who is loyal to and can be trusted by a specific person. It usually refers to a person who will support, help, or defend another person, often in a personal or professional context. Full definition
I'd like to find a gal who likes guys who like to dress like gals. (crossdresserhookup.com)
We all have our own definition of what makes this silly sport so enjoyable, but it frequently has to do with guys in certain helmets playing good ball. (sbnation.com)
Too often I've fallen for guys who didn't nurture me in the ways I needed. (singledatingdiva.com)