While moving through the pyramid looking for Scar (the surviving Predator), Alexa jokingly asks Sebastian "How do you say 'scared shitless' in Italian?" He answers with "Non vedo l'ora di uscire da questa piramide con te, perché mi sto cagando addosso...More or less."
Translated, that means "I can't wait to get out of this pyramid with you, because I'm shitting myself."