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1. ex
1) One of your previous significant others whom you've had a relation-shit, and coincidentally, a break up with. In most cases, not someone you ever want to see again. In very VERY rare cases, someone you might still talk to and consider a friend, because you both have a history and too many experiences to forget about together and are both mature enough to push any emotions you have left (if any), aside.

2) Your current bf/gf's ex. AKA an evil being that must be destroyed, at all costs. If you're a girl- for some reason, your bf's ex always seems to be a blonde with big boobs and a shitty personality who for some reason, makes you feel fat. If you're a guy- somehow, your gf's ex is famous among every girl you know, and if you ever bring him up, they can't stop telling you how "funny" and "amazing" he is. You also can't stop yourself from wondering if his equipment's bigger than yours.

1) The last two months of me and my ex's 1-year relationship were hell due to our constant fighting over stupid shit. So we broke up and I never want to see him/her again.
-or-
My ex and I broke up after dating for two years because he/she had to move. We got along really well during those first two years, so we still keep in touch.

2) (After current gf meets ex gf)
Gf: "Well... she was pretty."
Bf: "Uhh..."
Gf: "...Does this skirt make me look fat?! She was skinnier than I am! Why'd she have to be so skinny? What is she, anorexic?!"
Bf: "You look fine. You're just feeling the jealousy and insecurity that can only be brought on by seeing your significant other's ex..."

2. (s)ex dream
An extremely awkward form of sex dream where the dream-partner in question is an ex-lover.

Unlike normal sex dreams involving your current partner, or a random friend/acquaintance, (s)ex dreams are disturbing because you KNOW what the sex with that person is like (and so the dream is more realistic), but have valid reasons why you are no longer with them.

General feelings upon waking include: feeling dirty and ashamed, horniness, guilt, nausea and confusion. These feelings are amplified if you found yourself enjoying the experience.

Even more awkward when you are in bed with your current partner and you have a (s)ex dream.
I had a (s)ex dream about my old girlfriend, Claire, but I woke up feeling really guilty because I was in bed with my wife.
3. s- ex
Adding S before any words started with ex- when talking about sex.
Examples:
sexposed
sextreme
sexploring sextreme environment
etc.
I changed the title of the book to "s- exploring S- extreme Environments". LOL
4. S-EX
Pronounced es-X The sex you have with an ex boyfriend or ex girlfriend after you have broken up with them.
I saw my ex girlfreind lana at the bar last night. We talked for a while, and old feelings started to come back. One thing led to another, and before you knew it, we were on my bedroom floor having S-EX!
5. T(S)EX
Originating at The University of Texas at Austin, T(S)EX is the act of having sex in a dormitory bed.
They had so much T(S)EX after they officially became boyfriend and girlfriend.
6. going over the wall
Hanging out with a friend's ex, even as friends.
Person A: Don't tell anyone, but I went shopping with Will's ex Rachel. She's just so cool!
Person B: Wow. Going over the wall. Bold statement.
7. ex-box
An ex-girlfriend that was kept around only for sex.
Dave's ex-box was smokin hot, but she was such a total bitch.
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