There are "Trills" & then there are "Shakes"; to me, it sounds like Danno is describing a "Shake"(listen to EW&F's "Shining Star"...Verdine White does a tone of them on that track).
Another common Funk device & "Trill"-related...
Slide up to a target note with your pinky(e.g. say the "E" note on the G-string)
Then play a trill a step lower(D-D#-D-D#-D-D#)
A simple example would be-
Code:
[1_-----a3_-----a][1_-----a3-&_4e&a]
[E_-----EE_-----E][E_-----EE-E_DD#DD#]
BOLD E= OPEN "E"
All others played on the G-string(9-8-7 frets)
The "Trill" is on Beat 4 of bar 2(in Red)...use your index & middle fingers to play(fretting hand).
Slide into the '
E' at the 9th fret/G-string
You can also 'Shake' the D-D#-D-D# part.
***Experiment at putting these 'devices' at other places within the bar***