Well, as previously posted, masu (pronounced mahs - the trailing 'u' is almost unvoiced) is a polite suffix for many verbs. Since verbs are normally at the end of sentences, it could be any of a whole list of announcements. "Have a nice trip," "watch your step," "beware of the approaching train," "please come again," "we have bananas today," almost anything. Could have been mairimasu, arimasu, or any number of other sentence-ending verbs. Kind of like asking what "-king" at the end of a sentence in English means. Could be talking, walking, hiking, smoking, almost anything.

JR