Dic·tion·ar·y

Asymmetric warfare

1. When “two belligerents are so mismatched in their military capabilities or accustomed methods of engagement that the militarily diasadvantaged power must press its special advantages or effectively exploit its enemy’s particular weaknesses if they are to have any hope of prevailing.” —Wikipedia
2. Occurs whenever David attempts to best Goliath.
3. Occurs whenever you file taxes with your country’s federal revenue agency.

a·sym·met·ric war·fare
Etymology: commonly used, erroneously, as a buzzword for terrorism.