This is the 8622nd most frequent Swedish word.
blåsa
"Blåsa" in Swedish means "to blow" or "to blister."
In this sentence, 'blåser' (present tense of 'blåsa') is used to describe the wind blowing, indicating weather conditions.
Det blåser kallt idag.
It's blowing cold today.
Here, 'blåste' (past tense of 'blåsa') refers to inflating a balloon by blowing air into it.
Jag blåste upp ballongen för festen.
I blew up the balloon for the party.
In this usage, 'blåsa' (infinitive form) is a colloquial term meaning to deceive or trick someone.