1º_ Although it is already an archaism, it means "blowing, throwing air", which can be either fucking (with a bellows) or snorting (with the mouth or nose). It comes from the Latin sufflare ("to blow"). 2º_ Scrape the skin producing irritation. It looks like an apheresis of skinning in the sense of peeling. 3º_ There is another meaning in America that can have as its origin any of the two previous ones, and that is to "go crazy, have an extravagant behavior, be under the effect of narcotics"; this is why it is interpreted as both "violating" or "being gone, disconnected from reality". It is possible that there is a reference in 'sollar' to "smoking some drug", by the blowing; but also 'skinning' was once a way of saying "shave the head, cut the hair" and figuratively "cut the head, slit the throat" which is more easily associated with "losing the head, the control of the acts". It has other vulgar versions such as chollar or soyar.