You're such a scatterbrain - you lost your keys again!
Tips
memory
糊涂 ('muddleheaded') + 虫 ('worm/bug') - calling someone a 'muddle-bug'. The 虫 suffix is a common informal way to label a habitual type of person: 懒虫 (lazybones), 跟屁虫 (hanger-on), 网虫 (internet addict). It's affectionate-teasing rather than harsh.
