How to say i not able to drink too much liquor?

[mampwamp]

How to say i not able to drink too much liquor?
I am a bad drinker?

 

[Rover_KE]

I'm not a heavy drinker.

I don't drink much.

After half a glass of Blue Nun I'm anybody's.

 

[Raymott]

How can I say I'm not able to drink too much liquor?
I am a bad drinker?

"I'm not able to drink too much liquor."
Otherwise it depends on the reason you are not able to drink it, or the reason that you are explaining this.
"If I drink too much liquour, I turn into a raging maniac."
"I can't hold my alcohol."
"I'm can't drink much, because I have to drive."
"I can't drink too much liquour, because after three drinks, I'm unconscious under the table."

"I'm a bad drinker" isn't colloquial.

 

[Boris Tatarenko]

"I'm teetotal" works sometimes. :-D

 

[emsr2d2]

No, Boris. "I'm teetotal" means "I choose not to drink alcohol at all".

In BrE, you can say "I'm a lightweight" or "I'm a cheap date" to show that you get drunk after just a couple of alcoholic drinks.

 

[Rover_KE]

Boris, don't forget 'Not a teacher'.