gibberish

/ˈdʒɪbərɪʃ/

gib·ber·ish

BrE /ˈdʒɪbərɪʃ/

NAmE /ˈdʒɪbərɪʃ/

[U] (informal)

words that have no meaning or are impossible to understand

SYN nonsense

You were talking gibberish in your sleep.