The 'sleeve' in this phrase is not literal but represents a secretive or hidden place.

Metaphorical Sleeve

Using this phrase usually suggests cleverness or preparedness, rather than deceitfulness.

Positive Connotation

This idiom is best for informal conversations and may not suit formal or academic writing.

Use this phrase to build anticipation, knowing you have a pleasant surprise planned.

The phrase implies that the surprise will be revealed at an opportune or strategic moment.

The hidden item or plan is typically something positive or beneficial, not negative.