Cock block American British vulgar slang
To prevent someone from succeeding in sexual activity attempt
I hate my sister's boyfriend, so I will cock-block them so that they don't get any action.
James invited his girlfriend to his house for having private space but his friend's sudden arrival cocked block them.
The verb "cock" should be conjugated according to its tense.
The term appears to date at least to 1972, when Edith Folb documented its use by urban black teenagers.
To be in a difficult situation or get into trouble
We broke the vase. We are in deep water.