Is an acronym for the words Based On A True Story. Can be used in many different situations, for an example when referring to a film. Might also be used when telling a story or a rumour. If exaggerating,
B.O.A.T.
S.
may be used to guarantee the truth (or some truth) of the story.
One should though, observe that there is a thin line between
B.O.A.T.S. and T.S. (True Story).
B.O.A.T.S. is not always reliable and one should be aware of the fact that there might be a very small amount of truth in a
B.O.A.T.S. statement.