This does something essentially equivalent to showoff.io if you have a publicly facing server...

show

# Usage: show <local-port> <subdomain>
function show() {
    DOMAIN=".tekacs.com"
    REMOTE="$2$DOMAIN"
    ssh -tR 1080:127.0.0.1:$1 vps "sudo ssh -Nl \$USER -L $REMOTE:80:127.0.0.1:1080 localhost"
}

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more details on how this works from original gist:

The easiest option is to put the following in your ~/.ssh/config file:

Host vps
    HostName <server address>
    User <server username>
If you don't want to (or can't) do this, then the following will work:

SERVERUSER="<server username>"
ssh -l $SERVERUSER -tR 1080:127.0.0.1:$1 <server address> "sudo ssh -Nl \$SERVERUSER -L $REMOTE:80:127.0.0.1:1080 localhost"