TBD = To be determined/done/defined/dated/etc. It means you gotta play more games before they can determine what MMR you have (should say somewhere how many calibration games you have left, but I forgot where it was).
Solo MMR is your MMR when queuing for a game alone (not in a party with anyone).
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What is MMR:TBD? And what is solo MMR? Ive got 10 for that.