This is the 4198th most frequent Portuguese word.
toc
"Toc" in Portuguese refers to a light, quick knock or tapping sound.
In this sentence, 'toc' is an onomatopoeic representation of the sound made when knocking on something.
Ele sempre bate na madeira dizendo 'toc, toc'.
He always knocks on wood saying 'knock, knock'.
Here, 'TOC' is used as an abbreviation for 'Transtorno Obsessivo-Compulsivo', which translates to Obsessive-Compulsive Disorder in English.
Ela é extremamente organizada; alguns dizem que ela tem TOC.
She is extremely organized; some say she has OCD.
In this case, 'toc' is used to convey the repetitive sound of tapping, akin to an auditory representation.