The act of trying to convince a prostitute that you would be a better pimp for her than her current pimp. Succesful knockin' is called being "knocked" or being "knocked' out".
1.) extremelyattractive; smokeshow
2.) awesome, cool
3.) To have a completely kick ass and awesome gym sesh by being a straight beast and making every other guy feel weak and vulnerable
1.) Dude, I went to that party, and that chick was grinding all over my dick. She was so knockin, bro.
2.) Bro, I went to go see that new Wahlberg movie with Timmy Hamilton, and that shit was just knockin bro.
3.) Dude, my gym sesh today was knockin, I made every other guy feel like a fucking pussy because I was shruggin the hundos like a boss.