"خاصر" - Translation from Arabic to English

You like tri-tip? I grill a mean tri-tip. we could do a barbecue.
،أشوي لحم خاصر رائع بوسعنا إقامة حفلة شواء

I thought I was a loser. So I went away and transformed myself into what I thought was a winner.
أعتقدت أنني خاصر لذلك ابتعدت وحولت نفسي لما اعتقدت انه فائز