daddy on the spot
A guy who acts like he's the dad even though he's not related. He helps out with the kid, gives them gifts, and might even yell at them like they're his own. He's the kind of guy who shows up uninvited and expects you to be happy about it.
He showed up at the kid's birthday party with a cake and a new backpack. I didn't even get a present.
He started giving my kid homework help and now they think he's the best teacher ever.
He took my kid to the mall and bought them a whole outfit and then said, 'You're my kid now.'