The down nod is a typically male greeting meaning "Hello." It is used for those you consider your equals as well as those you respect. It is more formal than the up nod.
I saw my professor walking down the hallway towards me. I gave him a down nod as a sign of respect.
Also known as the "relationship hand hold" the waffle hand hold is when two people hold hands by lacing their fingers together. It's a higher level hand hold, surpassing the pancake hand hold in intimacy.
A: Fred and I held hands waffle style.
B: The waffle hand hold? I didn't know you guys were that serious.
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Guys typically use the up nod as a sort of "sup" greeting. It is less formal than the down nod.
Jay gave me an up nod as I walked down the hall. "Sup," I replied.
The pancake hand hold is the most conservative of the hand holds. Used most commonly in a parent-child relationship. Palms together, fingers are not interlaced.
A: Let's hold hands.
B: Okay but only a pancake hand hold otherwise people will think we're dating!