English to Spanish Other General / Conversation / Greetings / Letters sexual? colloquial...

This is part of a conversation between 3 guys which have just taken some Viagra pills to apparently ease the altitude effects in Chile.

One of the guys drinks some water with the pills, and the second guy asks for some water too:

"I’m going to have a massive neck if I don’t have some of that." My naive question is: is this an euphemism for "erection" or is he just talking about a swelling neck as an effect of the pills??


CLARKSON:
Apparently, Viagra for reasons unknown to science stops you having an oedema in your lung.

HAMMOND:
I thought it was more in the trouser department it concentrated on.

CLARKSON:
Well, that might be a side effect of what you’re about to do.

HAMMOND: Down the hatch.
CLARKSON: Here we go.
HAMMOND; Nothing is happening.
CLARKSON: I can’t swallow it.
MAY: It doesn’t work.
HAMMOND: Nothing is happening.
CLARKSON: I can’t swallow it.
HAMMOND: Nothing is happening.

MAY:
I’m going to have a massive neck if I don’t have some of that.

CLARKSON:
Apparently, that will save our lives.

MAY: Don’t make me laugh.

CLARKSON:
Just taken Viagra on top of the Andes.