Grandpa : Hey Bobbie, I hear you had to visit the doctoryesterday. Is everything OK?
Grandson : I'm fine, Gramps, thanks for asking. It was just a little itch down yonder. A leftover gift from a girl I dated last week.
Grandpa: Oh, I see. You're taking me back to my youth, sonny.
A little pest who likes to burst into your room while your doing homework, or playing on your phone. They like to hit you, then like a little bitch, they tell your parents when you hit back. In other words...they are annoying. They are so annoying they make you feel like banging your head against the wall so hard you lose all your brain cells.
You: *on your phone*
Younger sibling: *bursting into your room and runs up to you* Hey!
When a woman ages and another younger version of herself steps onto the scene, be it innocent or not, she feels threatened. Said women will unleash fury on her partner if he so much as looks at younger model with the slightest hint of admiration. This fury may not be overt but layered into nuances.
Steve:
Dude what's wrong with your girlfriend? She's got some serious sand in her vagina. She only seems to get like that when Alison* is around.
Mark:
Yeah she's just suffering from "younger model syndrome"