Initialism of Short Message Service. A text message sent on a cell phone.
"The police received multiple sms about the suspicious activity in the neighborhood, where each message referred to a separate small motor vehicle involved in different accidents."
plural of SM
In plain English: An sms is a short text message you send to someone on your phone without paying for it.
"I sent him an sms to let him know I was running late."
To send a message on a cell phone.
"I will sms you the details as soon as I arrive at the meeting."
In plain English: To sms means to send someone a short text message on your phone.
"I will sms you later to let you know I am on my way home."
Initialism of Sega Master System.
"The SMS console was released by Sega in 1985 as a competitor to other home video game systems."
The term comes from the German word SMS, which is an abbreviation for Seemanns-Meldung meaning "mariner's message." It was adopted into English to refer to short text messages sent via mobile phones.