Wingin' It (5e Feat)
From D&D Wiki
Prerequisites: Charisma 13+ or the Lucky feat
Don't have a clue what you're doing? That's fine! Just wing it.
You add half your proficiency bonus, rounded down, to any ability check you make that doesn't already include your proficiency bonus. Out of combat, you may also add your Charisma bonus to these checks, if not already applied.