'Hit my phone up' used only by people called Justin Bieber in songs. It simply means 'hit me up' or even more simply 'call me' or 'text me on my mobile telephone' but that wouldn't cut it as a lyric in his song.
1) You are the reason my phone wake-up from sleep ( black screen brighten up).
2) Contact.
3) Still in contact.
it can also be translated as no other girl contact me or even though we are not a couple anymore but I ain't in love with anyone else and on your call my phone react the same as it used to be ( this situation is a part of moving on).
An arse splittingly wide shit, usually the result of stuffing yourself the day before with kebab, steak, fine cheeses, etc... and dehydration caused by excess alcohol.
"Yo this dude really said Shut your dangoranapa watching bi mf panties in a twist pressed no home disowned loan owned blue gnome brick phone ass up lmao"