Attention-seeking Urban Dictionary users who opt to write about their own experiences/inside jokes in the first person rather than provide definitions one typically expects a dictionary to have.
"Is Urban Dictionary my mom?" Is asked when someone is a troll, or when dictionaries look for their long-lost mother from their DNA Tests. The less common reason why this is searched is from when a parent tells their child Urban Dictionary is their mom. The answer to this question is no, Urban Dictionary is sadly, not your mom.