bollocks (someone) up

Translations
испортить (кому-то) дело
The rain bollocksed me up during the picnic.
Дождь испортил мне дело во время пикника.
Definitions
To make a mess of something; to do something badly or incorrectly, often causing confusion or problems. In British slang, 'bollocks (someone) up' means to ruin or spoil something for someone, or to cause someone to fail.