Verb:1. The act of making a snowman, rolling it into another person's yard, without the consent or knowledge of the reciever.
Noun:2. A Snowmanner is someone who preforms the act above.
Adjective:3. A snowmanning could be referred to as someone who would be the type of person who would go snowmanning.
Most like TeePeeing a yard, but in the winter months and without the nuisances of toliet paper.