Inserted into a text convo or internet chat to insinuate a natural lisp. Often times takes the place of an s, or is added onto the end of a word to display an intentional lisp, or to acknowledge that one's lisps in normal conversation.
"m8 i have already banged two different girls in the same day."
(reply)
"tshhhhh, bruv the only two girls you be banging is ur mamma n ur grandma...if that"