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what does lmgtfu mean?

For every other non-native speaker like me, ttbomk: lmgtfu, let me Google that for you.

Can you do an eli5 of what ttbomk means?

"To The Best Of My Knowledge". (I had to Google it, too.)

Or was that an ironic reply?

afaict that was serious

Let Me Google That For U (usually LMGTFY)