A commando is a combatant, or operative of an elite light infantry or special operations force using dedicated operation techniques. Originally "a commando" was a type of combat unit, as opposed to an individual in that unit.

What does commando mean in slang?

“Going commando” is a way of saying that you're not wearing any underwear. ... So when you're not wearing any underwear, you're, well, ready to go at any moment — without pesky undies in the way. Linguistic jokes aside, going commando may actually have some demonstrable benefits.

Why is it called go commando?

Going commando is said to have first been mentioned in the 1970s as a slang term on American college campuses around the same time as the Vietnam war. ... So, the phrase 'going commando' likely evolved when military personnel ditched their undies to prevent the condition or to stop chafing.