I used to play this one on Gaia!

Player 1 - POSTS A TABOO LETTER
Player 2 - POSTS A WORD WITHOUT THE TABOO LETTER, -and- A NEW LETTER
Player 3 - POSTS A WORD WITHOUT THE TABOO LETTER, -and- A NEW LETTER
And so on and so forth.

Let's start wiiiith:
TABOO LETTER = L

tired, e

sleepy, e

monster, T

Sleepy, t

Trying, r

sleep, e

Juice, j

monstrosity, O

glitter, R

Lasagne, A

hypothyroid, K

bitter, T

scissors, R

SAD, E