verb/lenˌɡwaɾse la ˈtɾaba/
to fumble with one's tongue, to stammer, to stutter
“Se me lengua la traba cuando hablo en público.” — I stutter when I speak in public.
Synonyms: trabar la lengua
A metathesis of trabarse la lengua (“to fumble with one's tongue, to stammer, to stutter”), as a metasemantic emphasis on the act of messing with one's words.