Lyric discussion by untilrecently 

Cover art for The Frug lyrics by Rilo Kiley

i also think it's about a girl who really likes this guy but he has a girlfriend. she's trying to tell him that shewould be a better girlfriend to him by listing all these things she can do, ('i can hate your girl, i can tell you she's real pretty, i can take my clothes off/i can write a book, i can make some mac & cheese, etc'). basically telling him she's worth it. then she stops herself by saying she won't let herself fall in love with him because he's taken (i cannot fall in love, i'll never fall in love, i cannot fall in love).

she also tells herself that she'll have to learn to be happy without him and that she can't cry over this guy ( 'i can do the frug/i can do the robocop' = silly dances that make you happy, 'i cannot do the smurf' = being blue or sad). in the end, she has to deal with it and move on despite her strong feelings for this guy.