LMPOSVMCFOAISMT

It's an extreme version of LMFAO.
Stereotypical English person.

Stands for "laughed-my-posterior-off-so-vigorously-my-cylinder-fell-off-and-i-spilt-my-tea"

Sir, that link you sent me was quite hilarious. I LMPOSVMCFOAISMT.
LMPOSVMCFOAISMT? I'm not sure I quite understand the meaning...
I laughed-my-posterior-off-so-vigorously-my-cylinder-fell-off-and-i-spilt-my-tea!
LMPOSVMCFOAISMT
LMPOSVMCFOAISMT