from what i understand, Tical is a slang term meaning "adulterated marijuana". usually, it is weed that has been treated with some sort of pesticide or other aerosol spray, but it can also refer to weed laced with some unknown (but definitely controlled) substance.
keep in mind, smoking anything soaked in pesticides is absolutely, positively bad for you. no one should ever engage in this activity ever. furthermore, unless you know for certain what's been put into your ganja, you probably shouldn't smoke it, for safety's sake.