Being interrupted mid-masturbation. Can be when one is directly caught in the act or is interrupted by other means, i.e. an unexpected guest at the door, a phone call, someone coming to check up on them, etc.
Resulting condition: In which Kirk endeavored to learn Lt. Uhura’s first name and was defeated upon learning of her continuing relationship with Commander Spock.
Likewise;
Commander Spock’s surprising kiss with Lt. Uhura on the transporter, leaving a flabbergasted Kirk to look on in surprise.
All definitions under stipulation of Star Trek, the 2009 film directed by JJ Abrams.
In normative terms: Receiving rejection from a girl because of a pre-existing relationship or partiality with/to another, completely expected guy.
Not to be confused with the term spock block, which denotes that Spock is the one being blocked and not Kirk.
{After having been turned down, a guy returns to his friends, all of which then watch another, much less 'qualified' male approach the woman, ready to laugh at his impending failure. When she leaves with him, all the friend's buddies have a laugh at his expense, calling out "Spock Blocked!" in mocking tones.}
When working your way up the corporate ladder, the vindictive boss who blocks your promotion into a position where you would finally have a stake in the company.
I was on the fast track at Enormoco until I was put into Gene's department, and he proved to be a real stock blocker, never giving me the management position I deserved.