A bitch while giving a blowjob generally concentrates on sucking or licking only the tip. This kind of girl is usually scared or forgets that a guy wants his whole cock in her mouth. These types of women are heavily frowned upon by society.
Guy One: Did you get some good head from that whore last night?
Guy Two: Hell no bro she's a Tip-Sucker. It took me 45 minutes to cum.
Guy One: Damn dude that sucks.