Do The JJ

Do The JJ (d th JJ)
V
1. Ignoring a person while nodding your head.

[Do; Middle English don, from Old English dn. See dh- in Indo-European Roots.]
[The; Middle English, from Old English the, alteration of se; see so- in Indo-European Roots. ]
[JJ; English (US), from Jayanth Jayanth Indian (Karnataka) Roots]

Usage Note ( 'Do the JJ' situations):
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Sly: Dude ... I wo'nt be at home for few days. Can you feed my fish ?
JJ : ( Nod ... Nod ... Nod )
Sly: Do you have the slightest idea what I just said ?
JJ : Say what now ?