Definition of BTTS

What does the term "BTTS" mean in the world of sports betting? What is meant by the term "BTTS"?

In sports betting, the term "BTTS" refers to "Both Teams to Score".

This one is fairly straightforward.

Do you think that both teams will score in a game? If so, you'd want to bet the "Yes".

Do you think that one or both of the teams WON'T score in a game? If so, you'd want to bet the "No".

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For instance, let's say that Chelsea is playing Manchester City. You might see a line that says something like this:

Both Teams to Score?

Yes, 1.85
No, 2.25

In this case, the "Yes" side is a slight favourite, while the "No" side is a slight underdog. Chelsea and Man City both have pretty potent offences, which is why the bookmakers would assign this line as a slight favourite to win.