[all there] or [all here] {adj. phr.}, {informal} Understanding well; thinking […]

[be off] {v. phr.} 1. {v.} To be in error; miscalculate. […]

[bee in one's bonnet] {n. phr.}, {informal} A fixed idea that […]

[beside oneself] {adj. phr.} Very much excited; somewhat crazy. * /She […]

[bughouse] (2) {adj.}, {slang} Crazy, insane. * /Joe's gone bughouse./

[crazy] or [mad] or [nuts about] {adj. phr.}, {informal} Excessively fond […]

[drive one ape], [drive one bananas], [drive one crazy], [drive one […]

[drive one round the bend] {v. phr.}, {informal} To upset someone […]

[drive someone bananas] or [drive someone nuts] or [drive someone ape] […]

[flip out] {v. phr.}, {slang}, {informal} To go insane, to go […]