I replied to this guy’s snapchat story that i’m seeing saying he looked good and I missed him and he replied back with “oop” what’s that mean?

I’ve been seeing him for three months and he’s always commenting on my stories and complimenting me and being flirty, but this took me for a loop… What does “oop” mean?

I replied to this guy’s snapchat story that i’m seeing saying he looked good and I missed him and he replied back with “oop” what’s that mean?
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