tailgating

verb

1. (form-of, gerund, participle, present)present participle and gerund of tailgate

noun

1. (uncountable, usually)The act of driving dangerously close behind another vehicle.
2. (uncountable, usually)A tailgate party (social event held on and around the open tailgate of a vehicle)

   “On his first encounter with tailgating in 2006, he was flabbergasted at the way rival fans mixed peaceably together at the parties. A Chicago Bears fan, he was warmly welcomed into a group of Arizona Cardinals fans and fed. "I was shocked and slightly worried. I thought they were going to poison me. It was just so odd."”

3. (uncountable, usually)Inappropriately gaining entry into a restricted area, past a checkpoint, by tagging along behind another person who is authorized.
4. (uncountable, usually)Synonym of front running.