A person vomits in public. Another person gets disgusted by the sight and himself vomits. Then the next person, and the next, and the next... forming a sort of Domino-like chain reaction.

The Hippie interpretation of the Latin Blessing ,"Dominus vobiscum" But your Too Stoned to say it...

when urinates on another, causes that second person to also urinate

A person at a party who moves around continuesly asking people out, all attempts at gaining companionship fail and result in the person gaining a reputation as being a weak 'player' or just being scummy person without much moral fibre.