to out someone = to reveal someone's secret publically (often used in relation to revealing people are homosexual)
I've never heard the phrase "out you on the spot" like that before. I can't help wondering, though, if it's a typo for "put you on the spot" which is a common English phrase and makes sense in the context perfectly. "o" is right next to "p" on the keyboard...
I'll be interested to hear from other people on this one!
Student or Learner