verb
to have no luck flirting; to get nowhere (trying to pull someone); go home empty-handed (without scoring)
“Ligamos con un tipo que llevaba unas preciosas botas de cuero; bueno, más bien fue Beth quien ligó, porque yo no me comí un rosco.” — We hooked up with a guy who was wearing lovely leather boots; when I say "we", I mean Beth did, because I didn't get lucky.
Synonyms: no comerse un colín, no comerse una rosca
Literally, “not eat a doughnut”.