Phenomenon where, when photographed, a pedophile will always have a creepy, lopsided grin which screams "I molest children". Such pictures are in sharp contrast to those of normal people, who generally have a deer-caught-in-the-headlights expression, and conventional felons such as murderers, who always frown. Typical features of a a pedosmile include tight, discolored lips, visible tounge, concealed teeth, a cocked head, twisted facial features, a bald forehead, disheveled hair, and a general aura of faggotry. Used in conjunction with other indicators, the pedosmile is an excellent method of early pedophile identification.
I was going to help that man find his puppy in exchange for candy, but then I saw that he had a pedosmile.
To have a permanent smile on your face when you are under the influence of any drug or alcohol. Most likely, somebody will have a permasmile when they are on really good shrooms and suffer from uncontrollable laughter that seems to go on forever.