Quite simply, call then drop - usually used as a reminder or so that someone can save your number. A call drop is a "missed call"; it is not a call which has been lifted.
"Yo Dave! What's your numbaaa? "
"give me yours and I'll calldrop ya!"
"07.."
*bzz* *bzz*
Calling a man a callboi is nice way of saying that he's a bootycall. Usually an aloof fuckboi, the callbio is extremely physically attractive but has extremely poor manners. Callbois may be younger and more immature than the females calling them. They are picked specifically for their poor manners and immaturity so the female can guarantee that she won't catch any feelings from good sex.
I haven't had sex in almost a year. According to Maslow's Hierarchy, sex is necessary for my health. I guess it's time to hit up callboi again.
Callblock of Duty is the widespread phenomenon of rarely being able to reach someone via phone while they are gaming, regardless of their choice of console (or PC) and irrespective of which game they may be playing. It is, however, particularly prevalent in serious Xbox gamers, specifically those who frequently play one or more of the Call of Duty game series. Your call will most likely ring all the way through to voicemail, as even the simple act of hitting the "Ignore" key on a cell phone might break said gamer's concentration and/or compromise their strategy/position. If your call goes directly to voicemail, said gamer has most likely already received and declined to answer several calls, triggering the automatic voicemail response feature of most cellular carriers, or he/she has actually turned the phone off to avoid further interruption.
A: "Hey, is Matt coming or not? We've gotta leave soon or we're going to miss the movie!"
B: "Probably not. He must have activated Callblock of Duty; I can't get him on the phone. We should just go... He'll call me back in like 6 hours."
Poker terminology. Used to describe a player who matches any bet regardless of the odds stacked against them to win the hand.
"I bet $50."
"I call."
"I bet $100."
"I call."
"What do you have? I have three of a kind, Aces."
"Oh. Busted straight. Thought I'd hit my three outter on the river, then I wanted to see what you had."
"What a callbox."