TERIMA KASIH?

Just now my phone was ringing while i'm looking for my headphone. there are unsaved numbers on the screen and its from Johor.

me: hello
unknown: hello, mie ada? (not so clear actually)
me: siapa?
unknown: erm..fahmi
me: oh sorry.takde nama tu kat sini
unknown: oh sorry eh
me: oh, xpe.terima kasih (????)


and now i wondering: what is that terima kasih for?


"haih, sometimes when our mind has been overworking due to assignments and so on, we could possibly utter words that we don't even know what are they referring to"