To steal something, take something that doesn't belong to you, probably in a wholesale/ongoing and devious manner. Visualize a rat crossed with a vacuum cleaner.
The intention is to prevent the addresses from being snarfed up by automated web scanners for use by spammers. (GNU Mailman 2.1.8a mailing list software)
To Snarf some one:
To step into a random or non random persons face and while doing this you shout the word,"snarf!"
If the individual jumps or is frightened by your "snarf" you have accomplished.
or it can be used as a replacement word.
" Hey, guys lets go snarf this little clown."
"oh yeah, man do it. it'll be funny"
"snarf!"
"hahahahaha, what a girl you snarfed him so bad"
or
"What the snarf!?"
"maaan i snarfed your mom last night, i was dissapointed."