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1. what's his face?
what's his/her face?

another way of saying, what's his/her name. it tends to be used more in the northern states, replaced in the south by what' his/her name.

It also is commonly used to replace a person's name when you can't remember it.
Jenny, remember that guy...oh you know he's kinda tall. Oh, what's his face?

Jimmy. Way to be vague.
2. what's his face?
Used in place of a person's name when you forget their name, but you think the person you're talking to knows who it is.
Billy- "Dad, is Mr. ... what's his face? ... taking you to the airport for your business trip, or do you need a ride?"

Dad- "Oh, Mr. Smith? No, actually I fired him this morning. Can you take me before you go to work?"

Billy- "Sure Dad, since you're the greatest!"
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