Development of 'lol'. Lolsie is a synonym for 'lol' but what makes it different is that fact that it has add ons, such as lolsieMAX (something which iS very funny) or lolsieHYPE (something which people can get excited about). The add-ons are not set, but are defined simply by the user.
Did you see him fall in the lake yesterday? lolsie/lolsieH20
Just seen an American fall into a bowl of chips ... lolsieYANK