Missinterhearing is when someone says something and you don't quite hear what they have said, but instead of asking them to repeat it you respond with what you think you have heard. Old people are known to do this frequently.
Housemate A: It's three days till we get internet!
Housemate B: WHAT? Did you just say that there are three days till we get INTIMATE? What the hell!!!
Housemate A: Dude, you totally missinterheard me.
Person A: Tonight I'm going to wear my sluttishly high heels...
Person B: What on earth are Cottage Pie Heels??
This is a sexual act usually performed by a woman. The woman takes a straw from a juice box and plunges it into the urethera of the male and begins to suck out the urine.
When you think that you're interested but you really are not interested. Thinking about doing an action at first, then not accomplishing it, due to the lack of interest in it. You are interested at first. But when you look and dive deeper into it. You really don't give a single F. Most likely is due to the lack of knowledge, which means you'll lose any interest in no time. Other possibility is getting involved into one thing and never get to do it, and leave it after a little to no time.
Alex: I am hosting an event in LA, you want to join?
Allen: Oh Yes! Sure! *Doesn't bother to ask*
Alex in the day of the event *Calls Allen*: Where are you bro?
Allen: I think I don't fit into it, to be honest. Sorry.
Alex: You could have just told me that it was a missinterest.