You´re right, I did assume the word was an attempt at some kind of vulgarity ( sh** or carp), but I wasn´t insulted by it.  I guess "ignorance is bliss". My real name is Kim, but you can call me Dim.

Some time later . . .  I see from J´s post today that muckkk clearly means a kiss. 

"I dont wanna give you a lovely and sweet ´´muckkk´´ anymore...peahhh!!!"

Apart from his original, unfounded, accusation, levelled at BM and myself,  I didn´t find anything acidic in his words because they were meaningless.