老娘风华绝代嫁你个土鳖老子玉树临风去你个山炮
[lăo niáng fēng huá jué dài jià nĭ gè tŭ biē lăo zi yù shù lín fēng qù nĭ gè shān pào]
This username uses strong, colloquial Chinese expressions to emphasize contrasts between oneself and others. The first part (‘I’m stunning/brilliant but I’ll marry a country bumpkin’) exaggerates self-esteem versus belittling someone else while the second half describes being dashing or handsome compared with a rustic person. It reflects some cultural background that contains slang from regional dialects in China.