Similarly to 4:20, the official time to begin drinking. Only applicable during weeknights as any time is the right time to drink on weekends.
Jeff: Want a beer dood?
Chapstick: ...This early in the day?
Jeff: It's 5:20, dawg
Chapstick: Oh ok, I'll have one.
By Karole
19-5-20-20-12-5
The numbers of the letters of the alphabet that spell the word "settle" as in "settle down". By saying this to someone, they will stop doing whatever they are doing to figure out what the numbers mean, thus settling down.
