A collaborative effort that becomes more work than it needs to be do to conflicting interests. As the number of people that are working on a project increases, clarity and speed of the project reduces, as errors, and inconsistencies increase.
When multiple couples in an area start snogging at the same time, as if it's contagious. Used derogatorily by singlepeople or those who dislike public signs of affection.
A disgusting snogfestation broke out at the party last night.
His rendition of 'Lady in Red' caused a bad case of snogfestion to set in.