The excessive and over use of "Lol" (aka laugh out loud) or any other internet slang for laughing including ROFL, LAWL, KEK, LEL. This also applies to the misuse of the words, or in a situation of which the word is not supposed to be used.
Guy1: and then he said "that's not a chicken, that's my wife"
Guy2: "OH HAHA THAT'S REAL COOL LIKE THE TIME I KILLED THE BEAR IN DOOM 3. HAHAHAHAHA"
Guy3: ....
Guy1:....
Guy1: lolocaust.