Good Face Day 

The phrase having a "Good face day" is reminiscent of having a "good hair day". A "good face day" occurs when someone's face (usually pertaining to a female) is looking especially nice. This can be used as a casual compliment. Telling someone they are having a nice face day does not mean that they do not usually look good, you are just saying they look extra pretty.

Although less common, the phrase can also be used in the negative; as in a "bad face day". However "bad face day" is only used by someone talking about him or herself.

A: "You are having a good face day"
B: "Thanks, I wasn't running late this morning so I had time to put on my makeup."

A:"Ugh, I am having such a bad face day!"
B:"What do you mean?"
A:"Do you not see the huge pimple on my chin and the bags under my eyes?!"

Good Face Day by JayRoseBee May 26, 2010

Good Face Book Day 

Where one receives many notifications and messages from people that one likes either as friends or desires in a more serious manner. A good Facebook day will generally leave said person in a good mood, feeling satisfied about one's social life (to the online extent).

1.) Bro I was overwhelmed yesterday when i got like 3 notifications and 2 messages all at the same time, even one from that person i've been getting at in biology class! It was a good Face book day

2.) Haha Joe was on Face Book for the entire day yesterday checking over and over again like he was expecting someone to comment on something. He must've had a bad Face Book day.

Good Face Book Day by Chris Vonzentner October 27, 2011