Trivia: Domino, as played by actress Zazie Beetz, did not shave her armpits, visible during the fight on the prisoner transport convoy. Beetz felt that the character should reflect a changing female aesthetic.
Trivia: Yukio, who had previously appeared in the 2013 film The Wolverine, plays a short role as Negasonic Teenage Warhead's girlfriend and helps to defeat the Juggernaut.
Answer: That's one of his superpowers, "Comic Awareness" (sometimes called 4th Wall or Medium Awareness). This is something that Deadpool has in the comics and was incorporated into the films. Other than being a framing tool and to be funny, I don't know if the creator, Fabian Nicieza, or any writers have said why they gave Deadpool that power.
Bishop73
Deadpool's trait of breaking the 4th wall appears to have been the idea of writer Joe Kelly, as Deadpool didn't break the 4th wall for the first time until Deadpool #28 in May 1999, more than 8 years after his debut.
Phaneron ★