When someone pours himself a drink and his friend sees him and put his glass next to him so he can pour him a drink as well. this leads to more friends that put their glasses next to him waiting to get their drink.
This person is becoming the head of the pouring pyramid. And therefore, he's called "Ramesses".
"Hey dude, you've just poured all of us a drink, you're Ramesses."
"I coundn't wait any longer for someone else to start pouring the drink, i have to become Ramesses".