Roflcopter is a see also of ipml.

In internet slang|lang=en terms the difference between roflcopter and ipml

is that roflcopter is (internet slang) that made me laugh while ipml is (internet slang) i pissed myself laughing; used to indicate great amusement, usually exaggerated, at something (usually from an online source eg discussion group, or instant message).

As an interjection roflcopter

is (internet slang) that made me laugh.

As an initialism ipml is

(internet slang) i pissed myself laughing; used to indicate great amusement, usually exaggerated, at something (usually from an online source eg discussion group, or instant message).