What is You Know How We Do?
1.
1. To go
I can't believe you guys were at O'Mally's until 5:30 last night! That's insane!
Yeah, well, you know how we do.
See
2.
What a member of a group would say to suggest that some behavior is the group style, or that it's the way they usually do things. Usually said with anything from excitement to modesty, it is the response for anything from a compliment to disgust to total disbelief.
Was that you guys last night, outside the police station?
You know it.
Dude that's AWESOME/messed up/brutal/so fucking sweet.
Hey man; you know how we do.
See