ðə tˈɜːm eɪzˈɔltoʊ nævˈaɪdnjoʊ lˈɪɾɚɹəli, "kɹˈɪsməs ɐsˈɔlt"ɪz jˈuːzd tə dᵻskɹˈaɪb tə ðə sɚpɹˈaɪz vˈɪzɪt baɪ ðə tɹˈʌlə ɡɹˈuːp wɛn ðeɪ dᵻsˈɛnd əpˌɑːn ðɛɹ slˈiːpɪŋ fɹˈɛndz æt ðɛɹ hˈoʊmz tə sˈɪŋ pwˈɛɹɾoʊ ɹˈɪkən kɹˈɪstmɐstˌaɪm sˈɔŋz tə ðˌɛm ˈæftɚ ðeɪ hæv ɡɔn tə slˈiːp.
The term asalto navideño (literally, "Christmas assault") is used to describe to the surprise visit by the trulla group when they descend upon their sleeping friends at their homes to sing Puerto Rican Christmastime songs to them after they have gone to sleep.