I would just do them like regular slides. I might be wrong tho.

X's are mutes. Just mute the string with your fretting hand and pluck it. Do it with more then one finger or you'll be doing harmonics.
Quote by MH400
a girl on the interwebz?

You have 2 options.

1. Tits.
2. GTFO.

Its the same thing as a slide but you don't strum when you get to the next note