I made a random goblin insult generator at one point. You roll a d6, d8, d10, and d12, then combined them like this:
Your [1d10] [1d6] a
[1d8] [1d12]
1d10
1 face
2 mother
3 sword
4 father
5 magic
6 breath
7 physical appearance
8 brain
9 courage
10 honor
1d6
1 reminds me of
2 looks like
3 smells of
4 is worse than
5 is totally
6 conjures up terrible images of
1d8
1 stinky
2 dead
3 scaly
4 ugly
5 undead
6 less then auspicious
7 meddling
8 miniature giant space
1d12
1 fish
2 cheese
3 kobold
4 human
5 critical miss
6 vomit
7 ugly-head
8 kids
9 fungus
10 dung-heap
11 elderberries
12 hamster
Your [1d10] [1d6] a

1d10
1 face
2 mother
3 sword
4 father
5 magic
6 breath
7 physical appearance
8 brain
9 courage
10 honor
1d6
1 reminds me of
2 looks like
3 smells of
4 is worse than
5 is totally
6 conjures up terrible images of
1d8
1 stinky
2 dead
3 scaly
4 ugly
5 undead
6 less then auspicious
7 meddling
8 miniature giant space
1d12
1 fish
2 cheese
3 kobold
4 human
5 critical miss
6 vomit
7 ugly-head
8 kids
9 fungus
10 dung-heap
11 elderberries
12 hamster