In OS X, your Chrome cache is located at:
/Users/[username]/Library/Caches/Google/Chrome/Default/
To delete the cache you could type:
rm -rf /Users/[username]/Library/Caches/Google/Chrome/Default/Cache/
There is also a media cache in there that you can nuke:
rm -rf /Users/[username]/Library/Caches/Google/Chrome/Default/Media\ Cache/
Other Chrome data is located at:
/Users/[username]/Library/Application Support/Google/Chrome/