1. Someone who has a really small penis that couldn't even pleasure a mouse.
2. A plumbing company. "If it ain't working, call Guirkin!"
3. Someone who can't handle a drink and is often the first to pass out, this can end in them having pranks pulled on them.
1. Wow Michael's a right Guirkin!
2. Look's like your sink is blocked, you should call Guirkin.
3. Hah, he's such a Guirkin, let's abuse him while he's unconcious.