the ultimate cock block move. involves asking a person on a date while they are on a date with someone else. copulation not required but strongly reccommended.
We were best friends until I poach fucked his prom date. At least he got to take her home.
Someone who has immensely bad ideas, that they insist on implementing , which of course turns out to be a fucked up mess, then the person is in absolute denial of how fucked up it is, acts like a douche bag.