Pronounced Sot-Wall, SOTWL enables you to express your humorous reaction to any situation, without suffering from other normally caused annoyances such as:

-immature, adolescent connotations of words like lol.
-tediousness of using words like lol, due to overuse.
-words like lol rarely describing a person's actual response.

SOTWL, short for "Shitting On The Wall Laughing," bears no childish connotations, provides an exciting, unforeseen response to a comedic situation, and is so obviously not how a person reacted in response to an event, that it effectively eliminates all the flaws of words like lol. (Scenario 1)

In the case where a joke isn't funny, a person may respond with SOTWL anyways, because the use of the expression is funny enough to be a joke itself. (Scenario 2)