Usually used (by males) as a slang term to let one know that you're planning on masturbating. This comes from the knowledge that semen is of a sticky, glue-like consitancy, and would be perfect for, well; hanging posters.
Sal: "Hey, Jerry, you wanna hang out? Maybe get some lunch?"
Jerry: "Sure, but I just got a look down your mom's blouse and I really feel like hanging posters. I'll call you when I'm finished".
Sal: "Yeah, I know the feeling. I think I'll go hang some posters as well".