I'd be interested in the origin as well. By context, it would appear to be either an attorney (in the sense of "ambulance chaser") or any low life who crawls on the floor like a cockroach.
Even Urban Dictionary doesn't show it as it has appeared recently, as in "hired a tile crawler":
http://www.urbandictionary.com/you fit the description
Phrase that police use to justify arresting any African American in any situation.
I stopped you because you fit the description of a suspect who robbed a liquor store.
by D3uteron June 05, 2009
Not that Urban Dictionary is
definitive, but it's a start.
I gargled tile crawler in various modes, "tilecrawler," tile-crawler," etc and still didn't come up with anything related to its recent slang usage here and elsewhere.
First time I noticed the phrase was only a month or so ago, but then again, I'm pretty non-hip.
'Tis a puzzlement.
Terry