have a swelled head—(also: have a big head) have an exaggerated opinion of oneself; be self-conceited:
- Everybody over forty is tired and down and out, and everybody under thirty has swelled head.
have a thick head—(coll.)
1. be dull of intellect:
- You could have worked that out for yourselves if you hadn’t such thick heads.
2. have an aching head (suffering from a hangover):
- No more brandy, thanks. I’ll have a thick enough head as it is.