7:)8

The smilie for Matt Smith, who plays the Eleventh Doctor on Doctor Who.

The 7 is his magical swoopy hair.

The :) is his face (obviously)

And the 8 is his cool bowtie.

You can substitute any emotion!
7:D8

7:(8
7:|8

You can have your own Matt Smith!

Making this up basically, doing something for 7 days and 8 nights (you know 7 days a week 8 nights a week) and it could be just a Change in your life like waking up early or eating healthy like a summer goal.

7 8 9 the meaning of a sign of help. Not much know about it, I hate even people would use 7 8 9 like seven ate nine because we use it for help.

Young girls, usually in a group, that are always trying to create a new dance step. Usually around ages 12 - 15, they may or may not be involved in a dance program.
They are known by their calls of "5-6-7-8" as they begin each new routine.

if you have found this definition, then you're probably a bored superstitious person

Big brain

Referring to a murder of a person or persons over a police scanner.