神马脊薄玩意儿
[shén mă jĭ bó wán yì ér]
This online name combines internet slang and casual language. '神马' (shenma) means 'what' but is written to sound like the word for 'horse', making it a playful, informal term. '脊薄玩意儿' (jibo wentir) suggests something worthless or silly. The overall impression conveys disbelief or dismissive humor.