its a term used to put your arm around someone. you start with counting ur far shoulder away from them as one, two which is the closest one to them, 3 their first and 4th the farthest one on the other side and keep ur arm around them
Assuming you will have something before you actually have it; similar to "counting your chickens before they hatch" (which is commonly attributed to Aesop).
The act of hunting for sluts for one night stands. Shlunting is usually performed in dark, loud, crowded bars that play the kind of terrible music that guys will only tolerate because it attracts sluts.