I'm on it if you're on it

Means if the other person wants to do something, you'll do it with them

Person 1: What should we do on Sunday... I was thinking of maybe going CineWorld...
Person 2: I'm on it if you're on it (I want to go, if you want to go too then let's do it)

if you're over here who's flickering the lights?

Squidward’s famous words before he got his bussy chopped off by the hash slinging slasher

“I am not flickering the lights you dumb shit”
“if you're over here who's flickering the lights?”

It's not the angels' fault you're still a virgin at 30

Something to shout at males (usually) who exhibit creepy stalker-like behaviour around women (usually). This sleazy voyeuristic behaviour tends to happen in places and cultures where everyday interaction between the sexes is limited, actively encouraging the hunter/prey dynamic (following women, cat-calling, peeping tom behaviour, even assault). Frustrated males resort to even using technology to spy on females (telephoto lenses, mobile phones, drones etc), all the while blaming women for "limiting the supply of sex" or simply "asking for it!"

I see you leering at me and snapping pictures with your phone! It's not the angels' fault you're still a virgin at 30 - it's YOU!

you're so big

it can be used to describe a really big person, but is mostly used to describe someone with a big dick

damn you're so big (big person)

YOU'RE A POOPY HEAD!

YOU'RE A POOPY HEAD comes from a youtuber called "angry video game nerd" with the words "YOU'RE A POOPY HEAD! DO WE NEED TO SPELL IT OUT?! YOUR A POOPY HEAD!" and thus creating an internet legend

you know the "YOU'RE A POOPY HEAD!" meme right?

YOU'RE A POOPY HEAD!

An insult used by people under the age of 8. It is used when a child calls someone a "Poopy Head" It is also used in a joking manner by people over the age of 8. The word "Poopy Head" is basically "Sh*t Head" but for toddlers.

Child 1:" WHY DID YOU BROKE MY LEGOS?!"
Child 2: "Because "You're a poopy head!"

yep, you're banned

Sarcastic reply to a fat joke that was not intended to be rude, and was found funny by the recipient of said joke. The phrase is a reference to the steamer caseoh_ eho gets angry abandoned who makes a fat joke in his chat.

"Bro looks like a 1x1 Lego brick"
"Yep, you're banned haha"