Anxious

screw up

Meaning: slang depicting that a mistake was made

Example: I really screwed up this time. My wife will never forgive me for forgetting her birthday. Read on

butterflies in stomach

Meaning: to feel very nervous and restless

Example: He had butterflies in his stomach as he walked out onto the stage for his dance performance. Read on

ants in pants

Meaning: be extremely restless

Example: The young students just can't sit still; they must have ants in their pants. Read on