I would have assumed from the tone of the e-mail they meant "scab" but just got it wrong....

FWIW, "scab" is a term used to describe workers that come in during a strike and do the work of striking workers.   Doesn't apply here, of course, since we aren't a union and nobody's going on strike. 

AFAIK "scrub"s are medical clothing...

at least in Australia, a "scab" is also someone who never pays for anything and gets their friends to do the buying (shouting). Although it's an 80s term and I haven't heard it used in years.

there's also "scrubber" which is used here (and the UK I presume).

sorry Tom, to go OT.

If you ever find the idiot responsible Tom, donate a dictionary to him so that he at least can get his (or her) insults correct. 
I am sure you are right Lisa - he/she (or most probably "it") clearly meant "scab". It is not all that bad Tom, I'll hire you 

Quote from: vannphoto on January 24, 2013, 22:24
I recall the term "scrub" from a song a few years ago, but is that US slang? I'm not even sure what it means, though I can guess it's not a compliment.

Just a quick reply,  yeah it was a slang in the US awhile back and yes it was in a song.  I hardly hear it anymore though. 
TLC - No Scrubs ( Official )

^ I have had this song in my head all night. ugh.

Sorry Tom, to go OT and be glib.