Back In the Day. 

Regarding a time before you mattered. A time that you were not a part of. You must have at least 5 plus years on to even say this phrase.

Back in the day I didn't even work here because I don't matter and should never say back in the day.

Back In the Day. by GPJ4TH October 17, 2017

back in the day 

A time in one's life looked back upon with great fondness. Usually invokes a memory of a particularly memorable or traumatic incident.

Back in the day, we used to get drunk and cruise the city.

Back in the day, my dad had a mullet.

Back in the day, _________ was a lot cooler than now.

back in the day by JenThe80'sFan May 24, 2004

back in the day 

Referring to a time period previous to the present, usually recalled with a somewhat blissful vision.

Back in the day, I remember those good times we used to have hanging out at Lyon's.

back in the day by brainz November 7, 2001

Back in the day 

An imprecise time in the past for which I am too lazy to figure out the date or time period.

Back in the day bread was only 50 cents a loaf.

Back in the day by Specific Word Woman September 25, 2012

Back In The Day 

Reminiscing, remembering fun times, remembering a time when life was more simple

We'd play hide-n-seek only after dark, back in the day.
Back in the day, I could beat Mario Brothers in 10 minutes.
Back in the day, I'd bug my sister 'til she ran to her bedroom bawling, then laugh hysterically.

Back In The Day by DennyJr November 22, 2006

Back in the day 

Completely meaningless phrase which has gained inexplicable global popularity. It's an incomplete thought: Back in what day? It's a redundant way of saying "Once, I..." or "I used to..." and adds words without adding any extra meaning. Similar to the equally pointless "at the end of the day..." popularised by English soccer stars.

Back in the day, I used to be younger.

I was a child once, back in the day.

Back in the day by hunthill August 18, 2006

back in the day 

something from the past, sometimes from one's younger years, or the beginning of something.

"I used to play some ball back in the day."
"That team was actually good back in the day."

back in the day by Brit October 4, 2003