I am familiar with the expression. I just don't get why people feel the need to pass judgment on anybody else. If someone wants to be a mommas boy and hes not hurting anybody other than his social life so what concern is it of ours? Worry about your own life. Furthermore what gives us any right to make a judgment on someone else from our outside vantage point. Most of the people making these snap judgements know next to nothing about the person they're criticizing. Everybody has their own story. I have a good friend who has a mother who had a stroke when she was young he is wealthy educated well spoken well dressed good looking guy and in good shape... by any measure a good catch but he chooses to keep his mother with him. Hes hired her a nurse but he doesnt want to be far away from his mother should anything ever happen and she needed him, the easy thing to do would be to dump her off and be a playboy but he did the right thing not the easy thing. I've heard women say hes a mommas boy many times...they dont know his life just that he lives at home with his mom and hes over 40, I've heard he must be gay too and on and on but it's just nonsense talk from people who dont have a clue about what his life is about... I've got a younger cousin who had developed crippling social anxiety and we could not figure out why. He went from very social to a recluse and when he would go out he couldnt make eye contact with people he would look away as he talked he would stick close to the few people he felt comfortable around and often just stuck to his mom. People asked me why my cousin was so weird and why hes such a mommas boy clinging to his moms side the rare time he left the home. How could they know he had something wrong we didnt know. Turns out he had some fluke hormonal imbalance, it wasnt hereditary or genetic so our family had no idea what it was but they got him on medication to balance him out and hes slowly working his way back to that warm social happy kid he was. It is easy to make flippant remarks about others without knowing what they are going thru. These aren't every case of mommas boys but there are guys like these 2 as well so let people be... I dont know if it is this social media filtered world we live in where if the surface isnt perfect that we think somebody isnt worth our time so we can move on to the next or feel like we are entitled to make a snarky comment on their life like they're not people but an Instagram post but real life isnt so cut and dry and every one is going thru things, try to lift people up and try to be empathetic instead of critical.