for the 5th form

"I scream, you scream, we all scream for ice cream!"

for the 8th form

to get a like shock (= to be like shocked)

When one gets many more likes/retweets/favorites on a social networking site than usual.

for the 8th form

to crosstext

send the wrong text to someone while chatting online with many people at the same time

for the 8th form

to be in greeting orbit

When you're with someone and run into an acquaintance of his/hers. They exchange greetings, which leads to a conversation, and you stand there smiling and wondering if you'll ever be introduced.

for the 8th form

an almost-quaintance

a person to whom someone has sent a friend request or from whom he/she has accepted such request.

for the 8th form

a Friend surge  (to have/experience) 

adding a large number of friends or followers on social media in the hours after returning home from summer camp

for the 8th form

a phoneslinger

a person who texts back with lightning speed as soon as he gets a text message