Let's try this again:
This is a marketing ploy - These are trick texts to get your money or steal your info. The scam works since it makes you think you are being talked about behind your back, and being a child of smart phones and scared of missing out, you fall for this scam. -- Do not respond to this junk. Forward and report as spam.
I got the message "Yo nasty a guy was talking about you on Monkey.cool...." from this number and it's just a spam text from the Monkey.cool app that makes you download it by creating this scary scenario.