It's an abbreviation for "I Molest Orangutans". It's used by different members of the Orangutan Fetish Enthusiasts of America (OFEA) to secretly identify themselves to other members on various internet message boards and chat rooms. In the case of chat rooms another member may then PM the person that used imo with the abreviation asl? to see if they are willing to live stream thier orangutan molesting exploits, asl? stands for "ape sex live?". If the member then wishes to convey that he is willing to live stream the orangutan sex he will respond by listing the number of orangutans involved, the type of sex involved and where they are located like this 16/f/usa, that would stand for 16 orangutans/felatio/United States of America. OFEA hide thier devious monkey loving activities through the guise of various "front" organisations, such as the Ohio Festival and Events Association (OFEA), Ohio Future Educators Association (OFEA), {Ohio has a big orangutan fetish culture} and Oregon Family Equestrian Activities {look closely, they aren't horses and they aren't riding on thier backs}. OFEA gained noteriety in the late 1980's in England when the then Prime minister Margeret Thatcher was involved in a scandal when photos of her performing the sex position "the rusty trombone" on and adult male orangutan were leaked to the tabloid media. Following the shock revelations, there were desperate pleas by her fellow cabinet ministers to turn away from her large ape molesting activities. However Thatcher remained adamant that she would not stop fiddling with monkeys and so gave a press conference in which she used the now famous line "the Lady is not for turning". She was ousted from power several months later and was last spotted in 2003 in the Malaysian jungle fucking two orangutans simutaneously in the "wheel barrow position".