Law, according to Wikipedia (cite that to the court, ha ha), crap is a minced oath. A minced oath is an expression based on a profanity which has been altered to reduce or remove the disagreeable or objectionable characteristics of the original expression; for example, "gosh" used instead of "God," "darn" instead of "damn" and "heck" instead of "hell". I think your client's word choice was an effort to avoid using profanity. If he wanted to be profane, he would've just said sh**. I guess profanity, like obscenity, lies on a continuum. I think your problem is that your client's word falls pretty much in the middle of the spectrum between sh** and, I don't know, dung, droppings, feces?