What is full meaning SM in matrimonial adverting?

In matrimonial advertising, "SM" typically stands for "Seeking Male." It is a common abbreviation used to indicate that the advertiser is a female looking for a male partner.

The opposite abbreviation, "SF," would stand for "Seeking Female."

Keep in mind that while these abbreviations are common, they might not always be used consistently in all matrimonial advertisements. It's always best to check the context of the ad to understand the intended meaning.