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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.
by JenThe80'sFan May 24, 2004
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2
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.
by brainz November 07, 2001
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3
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.
by DennyJr November 22, 2006
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5
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.
by hunthill August 18, 2006
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6
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."
by Brit October 04, 2003
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