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A couple while backs is when you're so lost in the mess of your own brain that you forget how far back something was because you were too busy being a mess.
"I told you that yesterday, like, a couple while backs!", @messy_mind_mike
"I swear I saw that post like a couple while backs, but now it's 2025 and I'm still confused.", @confused_chris
"You said that like a couple while backs, and now I'm still confused.", @confused_chris