words, actions, or behavior making someone seem laughable and ridiculous
(Note: Ridiculing isn't necessarily teasing. Teasing implies saying or doing something unkind or ridiculing towards another, but that was done just out of silliness, which is why it's common to say, "I was only teasing. I was just joking")
Alternate spelling of 'ridiculous', brought about by the inability of wireless predictive text input (such as iTap or T9) to figure out what word was intended. It is also likely that the person inputting this word was a dumbass and didn't know how to spell 'ridiculous'. Hart@m is likely that person.