A statement made to signify that what you speak is 100% the truth, the whole truth and nothing but the truth. Usually used when someone doesn't believe what you say, as it is bullshit, but this is used to try and make that person believe its true as its probably not.

What it actually means may derive from the old saying of "I swear on my mum's life!" which means absolutely nothing but some people think if that statement is said that they can't be lying.

the replacement words for "i swear to god"

Usually said by drunks.
They think they're actually saying:
"I swear to god I'm not drunk."

Unforunately, they aren't.

something you say to somebody when you don't really give a shit about their story. this is a phrase usually used when somebody else won't shut the fuck up about something you don't give a fuck about. you usually let them talk for a little while but when they get to the point of being annoying, that's when you tell them, "Say I swear to God." In short, it's just another way to let somebody else know you don't care. When you tell them to say "I swear to God," they usually get the message right away after saying "I swear to God," and shortly afterwards realizing that it means you don't care.

A phrase that liars use as a last ditch attempt to instill belief in themselves to the person they're trying to con. It's always easy to spot a bullshitter when they pull out the infamous "I swear to god!"

the way an athiest or non-believer can express with utmost certainty that they are telling some-one the truth (as far as they know it to be).

the Southern Hospitality vernacular phrase for "I Swear" because bless their hearts they don't put up with no cussin, down here ya'll!