Tamagotchi love
A relationship developed through the use - solely - of text messages. The two actors flirting, reassuring and encouraging each other through regular texting. 
Three men stand in a bar. One man - a short man - is seen texting every 30 seconds, ignoring his beer.

Tall man: What's he doing?
Round man: It's tamagotchi love again.
Tall man: Uh?
Round man: If he doesn't keep texting one of them will die - or they'll have to meet.